I don't get one thing.

if pipe() works for RxJs, and hackpipe is not better, then why don't you simply stick with pipe()?

Just because one operator is there, doesn't mean you have to use it.

JS classes are notoriously under powered, so much that both react and vue prefer functions over class components

Besides, it is possible that RxJs (and other libraries) may modify how they work to better utilise hack pipe