As much as I like Rails, those are two examples of catching up. The approach from Active Storage has been the way uploads should have been handled for over a decade and Action Cable is good-enough-for-prototype but otherwise not scalable at all.
Over a decade? That long ago, we were storing image uploads in a BLOB column in Oracle! I used Heroku, AWS and GAE within a year of each of their debuts, and if I recall correctly, there weren't a lot of frameworks that had a handy dandy approach to generically storing uploads in <XYZ-CLOUD>. Were there any even?
And as for Action Cable, I hear anycable.io can give you a performance boost if you need it. I've used websockets in both Node.js and Java Spring and although it's awesome for some use cases, a majority of apps will never reach for it. So this is a good example of Rails focusing on things that will help most people without trying to cover every tool that everyone will ever desire.
