People need to stop fetishizing action. You only like action because there were a bunch of good action shows in the 90s and 2000s and now your brain conflates action with quality. What you really want is just good writing and art
Realism and detail are highly overrated. They can look nice when done well, but they aren't the be-all and end-all of quality in art, and I feel like people only want them because they're relatively uncommon today
We don't need more of this or more of that, we need more variety in general. More variety means more choice for the consumer, and more freedom for artists. Having more shows in different styles would solve basically every single one of /co/'s problems with the animation industry
Higher framerates look better unless you're doing intentionally limited animation a-la UPA. I know you don't NEED a high framerate to do good animation, but the best high framerate animation still will always look more natural than the best low framerate animation.
At the same time, good animation doesn't come from the amount of motion, it comes from the quality of what motion you have. I will always admire a head tilt where everything stays super on-model and consistent and solid the whole time way more than a super flashy fight scene where the characters proportions change constantly and their construction melts
The 2010s isn't as bad as /co/ makes it out to be. It's not as good as the 90s or even the 2000s, but your kidding yourself if you think they're anywhere near as bad as the 70s or 80s.
Most cartoons made from 1980-1987 have aged horribly and people only like them because of a combination of nostalgia and the small handful of very short well animated scenes that shows would have here and there every so often. Outside of those they had 70s tier animation and went off model so much it would make steven universe blush
People need to stop comparing western animation to anime. They're vastly different styles with vastly different audiences