I don't think it's the complaints nearly as much as it is the statements behind the complaints -- ie, WDW is penny pinching and not living up to its own standards, yada yada yada -- when in fact NONE of us here understand why things happen at WDW the way they do. Maybe they can't hire people to work the late-night shift to repair rides, or do housekeeping or be polite to every single guest that walks in the gates. Unemployment is at a relatively low level these days. Or maybe the higher influxes of people wear the rides down faster and because most of the headliners at WDW are 25+years old which makes them even more susceptible to breaking down, and there's no real way to replace them, because they need rebuilds, not repairs, but doing so disappoints and angers people who made their vacation plans two years ago. Maybe all the people in scooters need more time to get in and out of cars. Maybe FP+, while having the advantage of cutting down on individual wait times, has increased wait times across the board because people get ore spread out. You call them "cutbacks" without a single bit of actual evidence that a) budgets have actually been cut and b) those hypothetical cuts are the reason for problems. We don't see WDW's operating budget; we have no idea where this year compares to last years or compares to two or three decades ago. Yet people have absolutely no issue saying as fact WDW is cutting back in order to increase profits.
We don't know why bad things happen at WDW -- why rides get taken off line or don't run perfectly -- but the assumption is always because WDW is not doing the best they can to increase guest satisfaction. Just like you say every single complaint is defended, I'd say that every single complaint is taken both as gospel and an example that WDW is only out to steal as much money as it can from its guests. I'd also say that the commentary in a thread like this is aggressive in both its tone and assumptions. Many of the people commenting are not in the park at all -- they're watching the app and making commentary and criticism based on things they are not actually experiencing, and extrapolating into pretty wholesale condemnation.
I'd also add this -- I've been at WDW when rides have been down. it's disappointing. But its not a long-time and reoccurring issue for most of us. A lot of people here have gone to the parks without wholesale outages, and they want to make that point to people reading. Like you said earlier, you're nervous about an upcoming trip, and some people are just trying to point out that maybe, just maybe, those worries might not be as legitimate as these boards sometimes make it seem.