> How many Linux technologies have not been able to surpass their counterpart technologies after years of iterating? Two are top of mind: epoll and btrfs. Appl

> How many Linux technologies have not been able to surpass their counterpart technologies after years of iterating? Two are top of mind: epoll and btrfs. Apples and oranges. No one is required to use btrfs, it is one of many options for filesystems. In my opinion, btrfs is dangerously close to a failed filesystem design for a variety of reasons, but no one needs to use it. That is a good thing - some designs succeed and some not so much, and the successful ones survive and prosper, no need to change operating systems or anything like that.