Because if you don't make periodic cosmetic changes, people will think you're going out of business.
It's why your favorite shoe company, that you buy from every 2-3 years when you wear out your favorite shoes, always has new styles and discontinues other styles. Converse is a great example.
Generally I agree with you. My advice is that when you find a pair or shoes you like pick up at least 3 pair because by the time you need to replace them they'll be gone, but Converse isn't a great example of that because I can get a pair of Chucks which look/fit basically exactly like any pair I've ever had. It's actually kind of nice that Converse doesn't seem to play the same game as the tennis/running shoes I wear out.
FYI: You can't get the cons that they sold about a decade ago. They changed the sole a bit so they are now "slippers" in order to avoid tariffs. (I also suspect there's a reason why they also sell "boots" too.)
I do wish I heeded your advice. I bought some awesome Doc Marten boots/sneaker hybrids called "Boury" a few years ago, and they stopped making them. I can't find any in my size anywhere, like EBay. I walked all around Disney World with them in shorts, and they looked / felt awesome.
But when Apple released macOS Snow Leopard (widely held to be great), it announced 0 new features over Leopard, to much applause. It focused exclusively on fixing issues, and was better for it.
Journalists will report whatever they get fed anyway (notice how they all talk gleefully over the wobbly new iPhone with a jutting-out camera bump when only a few years ago they talked gleefully about how flat the iPhone was, and then gleefully wrote about how their screen estate was invaded by a notch etc), so if Apple focused on fixing issues instead of short-attention-span apps (when was the last time you used "Image Playground"?) the media could report how committed to reliability and quality Apple is, gleefully.