> Consistent syntax — same {} placeholder for files, lines, ranges, or lists

Inconsistent syntax native bash methods so its an additional syntax to learn.

> Template mode — single-quoted commands work as shell templates: enumerate -f '*' -- 'cat {} | head -5'

Passing commands a a single string is BAD. Now you have to think about escaping and quoting. What does {} get replaced with if the enumerant contains unsafe characters? Can it be used as part of a larger argument or only on its own? Who knows, it's not bash. Compared to a bash loop its also always a subshell with all the implications that has - even find can be piped into a normal bash loop.

> Filters — --include and --exclude with glob patterns

A fraction of what find or native loops provide. And since this can't replace them in general enumerate is an additional thing to learn on top.

> Extensible — drop a file in lib/enumerators/ to add custom sources

To extend bash loops you don't even need root access, you just add the code to the loop.

being consistent in a sea of inconsistency is a good thing, no matter how hard you try to paint otherwise. the solution have to start at some point. But the rest, yeah, scary.