noooo its just nostalgia!! games weren't better, they are better nowww!!!
Games in general have gotten worse, the quality only exists in the indie space nowadays. But there's 1000s of them, so it's not easy to find the gems. As for 3PP platformers... I guess the genre isn't all that appealing to developers. Maybe there will be a new one when someone has an idea for a new fresh take on it. Great games are made from great ideas and passion, rather than them being made to fill a gap in the market.