Tab completion was so novel back when full e2e AI tooling was not really effective.

Now that it is, I just turn tab completion off totally when I write code by hand. It's almost never right.

Emacs has completion (but you can bind it to tab). The nice thing is that you can change the algorithm to select what options come up. I’ve not set it to auto, but by the time I press the shortcut, it’s either only one option or a small sets.