You've answered your own question. You like 3rd-person shooter platformers, a genre which isn't as prevalent as it was in the 6th generation of consoles. Not as many games are coming out that fit your tastes. You're also nostalgic, which is perfectly fine, but you have to take off the goggles sometimes. I like Mario Sunshine better than a lot of modern 3D platformers, because I've been playing it for years and it was a big part of my childhood. But just because I love revisiting that game more than playing a new game sometimes, that doesn't mean modern games aren't reiterating and improving upon the things that made it great. A Hat in Time, Psychonauts 2, The Cosmic Shake, Spark the Electric Jester, Orbo's Odyssey, SEUM, Frogun, New Super Lucky's Tale, Supraland, Crash 4. So many great 3D platformers in recent years, with a ton of improvements to quality of life and control compared to where we were back in the day, as well as many new concepts.
Also, claiming that PS2 platformers as a whole look better than modern platformers as a whole is ridiculous, and you're also giving no examples of either case.
When people say mouse and keyboard is "better" than controller, they just mean that the skill ceiling you can reach on M&K is higher than on controller, which is true. At the end of the day, just use what you prefer. I can't imagine playing CS2 with a controller, and I don't think Far Cry would be nearly as much fun on mouse and keyboard, there's different cases for both. But you absolutely won't be able to stack up to people playing M&K in most competitive shooters, and that's what people mean when they say M&K is better.