Back in ye old days, TAB autocompletion was a big deal when it was new. It was then a big deal when it got a bit fancier in zsh. And it's stagnated since.

Now, with fzf in combination with other tools, I often ask myself: Why isn't this the default in most shells? When I now use bash, it seems very archaic.

Yes, there are a lot of improvements one can do with shells. I should start making a wishlist.

Have you tried any alternative shells? Bash and Zsh might be moving slowly but the non-POSIX shells are light years ahead of even Zsh.