Then what about enumerating backend libraries to build HTTP API? Just for Python I can probably find 10 of them if not more.
Yes but the premise is about tooling changing. Most commercial backend tools in Python are still using Django or Flask. That doesn't mean no new libraries will ever emerge. It's just that the pace of change is slower.
We use Falcon and FastAPI at my shop, both are very common and popular alternatives to the ones you listed. FastAPI is from 2018, it's more recent than any popular JavaScript framework (angular 2010, react 2013, vue 2014, svelte 2016).