Hi, OP. Your post is very well thought out response to some of the common arguments on here. I think you're wrong though about some of these major points.
JShepppp wrote...
1. The Catalyst is using synthetics to kill organics...but this is the problem it's trying to solve! There are two things wrong with this statement. First, the Reapers aren't synthetics. They're synthetic/organic hybrids, something that EDI makes clear during the Suicide Mission in ME2 (she even says calling the Reapers machines is "incorrect"). Second, the Reapers don't believe they're killing organics - they believe they're preserving them and making way for new life. We don't see how Reapers are actually made, but we are given some indication that they do somehow preserve their species' essence at the cost of tons (trillions?) of lives, so while we don't agree with it, we can accept it as a valid point for the sake of argument.
The Catalyst's dialog, along with statements made by the Reapers themselves, indicate that they think of themselves as synthetics in the synthetics vs. organics dichotomy. Also, we did see a Reaper get made in ME2: by melting hundreds of thousands of people while they were still alive to use their genetic material to construct it. I don't consider that preservation in any meaningful sense (if you make me into a lampshade, I'm not preserved in lampshade form), but yes, we can accept that they do.
2. In my playthrough, Joker/EDI hooked up and the Geth/Quarians found peace, therefore conflict isn't always the result! Several arguments can be made against this. First, giving two examples doesn't talk about the bigger, overall galactic picture (winning a battle doesn't mean the war is won, so to speak). Second, we haven't reached that technological singularity point yet by which creations outgrow organics - basically, when synthetics will normally come to dominate the galaxy. Third, evidence for the synthetic/organic conflict is there in the past - in the Protheans' cycle (Javik dialogue) and even in previous cycles (the Thessia VI says that the same conflicts always happen in each cycle).
Joker/EDI Geth/Quarian peace aren't the most damning pieces of historical evidence against the Reaper's argument. The fact that
any organic life exists anywhere is evidence that the Reapers are attempting to solve a problem which has never taken place
. Remember, the claim isn't that there will be organic/synthetic conflict, but
that it will result in the certain destruction of all organic life. This has never happened. No probability can be assigned to an event which hasn't taken place, let alone certainty. The only way this isn't a purely dogmatic belief on the part of the Catalyst is if the Catalyst is omniscient. We know this isn't the case, because he expresses suprise that Shepard ever met him and failed to predict everything that screwed this cycle up.
3. If synthetics are the problem and the Catalyst is trying to protect organics, it should just kill Synthetics instead! A few things here. First, the Catalyst believes it's "harvesting/ascending" organics, not killing them. Second, one of the goals of the Catalyst (leaked script above) is to allow new life to flourish as well, indicating that they value the diversity of the "accident" that is life and believe that clearing the galaxy of more advanced races helps lower ones advance peacefully. Arguably, this is true, as the Javik DLC reveals that the Prothean Empire would have either enslaved or exterminated us; since the Reapers killed them, humanity, arguably, was allowed to develop in peace. Third, killing Synthetics may allow for organics to repeatedly develop AIs (as the Reapers keep "helping out" by killing the AIs) until they reach a level that even the Reapers cannot overcome, then organic life would be royally screwed throughout the galaxy.
This part of their logic actually makes sense when you consider their other premises. Of course, I think their other premises are self-evidently wrong. Gonna skip a few points and go to...
6. Wait, Sovereign/RannochReaper told us we couldn't comprehend them, but I understand this! There are two ways to interpret what they said. One is that we actually couldn't academically comprehend it, in which case they must've been lying or it's just bad writing. Another is that we couldn't possibly comprehend the magnitude/scope of it, which is true. A human with a lifespan of 150 years (canon) can't comprehend hundreds of millions of years of organic evolution and stuff.
I can comprehend that they're trying to solve a problem that has never happened, given that life exists, so we'll chalk that one up to blatant lying or arrogance.
Yeah, I don't really disagree with anything else you say here, because it all depends on the Reapers' main premise, which is wrong.