So first it's a bit annoying to read this when I busted my ass for several weeks to refactor Active Record to make it more compatible with the Fiber use case in 7.2.

But also there is very little benefit to it for the vast majority of Rails applications out there.

Unless you are doing micro-services or something like that, your typical Rails application isn't IO heavy enough to run more than 2 perhaps 3 threads before contending.

So the overwhelming majority of Rails applications wouldn't see any benefit from being served via falcon, quite the opposite.

Async is great to enable some use cases where people would have to reach to Node before, but Rails will never be a good solution for that, if you want to do some sort of light proxy or websocket notification thing, Rails isn't a good solution, you want something much lighter.