Yes I don't think that demolishing whole ecosystems is a good thing. I think that it's a shitty mentality of wanting shiny and new shit and fixing what isn't broken. I am a believer in legacy support and I find it weird and concerning to see and hear people complain about it. You do realize that if Python had been the Web's scripting engine instead of JS, a lot of Websites would've been, and still would be trashed and unusable due to said breaking changes with zero regard for legacy support. Thankfully that wasn't the case, but it does go to show that legacy support and backwards compatibility is important.