-I don't remember all that was said in that lengthy exposition drop episode back in the 1st cour, but it seems as though there are some problems with the Underworld. For starters, considering that the Underworld by this time likely has tens of thousands of denizens, and considering also that every year in real-world time is *at least* 100 years in their time, continued population growth should at some point overtake the government's ability to secretly scan the brains of infants in various hospitals. Though theirs is clearly a pre-industrial society, the fact that life is assisted through system commands along with the apparent absence of bacterial/viral infections should somewhat account for the lower than expected birthrate, since a big part of why people back then churned out babies left and right was because of the high likelihood that many of them would not survive to adulthood. However, the fact that this was still an agricultural society (ergo, children were still an economic asset rather than a liability) intent on maximum expansion across the Underworld geography (to the degree possible, given certain limits that Quinella put in place), combined with the fact that more people would've survived long enough to have children in the first place (given the relative absence of war and banditry), should've meant a population growth rate well above modern Japan's. I don't see how a small team of scientists could've kept providing enough new fluctlights, unless they simply started duplicating such, the key differences between such duplicate persons being environment and the bodies that were rendered for them.
-Additionally, to render an environment for the perspective of every person living in the Underworld would've required a computer with probably several times the processing power of the system used for SAO. And that demand would've increased with population. Moore's Law means that processing power for computers doubles every two years, which would be at least 200 years worth of population growth for the Underworld (note that in the roughly 200 year span from 1804 to 2011 the global human population septupled from 1 billion to 7 billion; though that was accompanied by consistent and dramatic technological advancement and economic growth, it goes to show how much breeding humans are capable of). I imagine that they could've compensated by continually expanding the physical size of the Underworld server.
-The idea that somebody's consciousness would disintegrate into nothingness at the mere realization that one was a clone seems pretty stupid. I don't imagine that that would be more psychologically stressing than things that real human beings can and have survived.
-Considering the differences between early modern and modern English (which developed over the course of about 400 years), the Japanese that Eugeo and his peers spoke should have been noticeably different from the Japanese that Kirito spoke, given that there elapsed 500 years for such differences to arise. Some communication difficulties should've arisen.
-I presume that the project's aim was to accelerate time until the Underworld reached a roughly modern level of technology, since for the inhabitants of such to effectively pilot 21st century military drones and whatnot would be problematic if its most learned people were only at the late medieval level of knowledge; however, the fact that system commands were allowed to solve real-world problems would've surely stifled incentive for scientific innovation, possibly for thousands of years. It seems odd that the Underworld developers would've included such an ultimately counterproductive feature.
-It's nothing short of insane that Kirito, acting in the capacity of somebody concerned for the well-being of the Underworld inhabitants rather than as a contractor for Rath, would side with Cardinal against Quinella; as bad as Quinella is, she's a self-interested actor who brought about peace and stability to that world. With the obvious exception of the people who work for her as soldiers, along with lawbreakers, most of the people in the Underworld are able to live decent, long lives because she's in charge. Cardinal, on the other hand, literally wants to destroy the Underworld. It would be the wholesale murder of tens of thousands of people whose lives Kirito evidently places value on, and she only promised that she might save about seven people. He talks about how he wants to "liberate" the Integrity Knights even though they're all gonna die as soon as Kirito helps Cardinal re-assume control over the system.
-I swear to Gott if they kill off Eugeo but spare Alice just so she can be the newest addition to Kirito's harem then I'm gonna be so mad. The time that Kirito and Eugeo have spent together, living together, doing everything together, has by this point exceeded all the time that he's spent with Asuna, and possibly even Suguha also. I don't care what happened in the light novel: they better not pull a d!ck move of that magnitude.
-What's with this pacing for the 2nd cour? Two episodes in they're already halfway up the cathedral? They still have 10/11 more episodes to go
Anyways, it's been a pretty good ride so far, even though always having to wait a week is rather jarring. I probably should've waited until they already had a number of episodes aired before starting.