> It is a glorified tab complete.

Interesting metaphor. Notice how the Bash tab completion is a great tool, that increases people's productivity by a large amount, and receives only complements from anybody you ask. At the same time, the newish Windows cmd tab completion is a great productivity destroyer that gets mostly only criticism and you will find way too many people blaming it for losing data.

Do you know what is the difference? The bash tab completion is always correct. If it can't be correct, it gives you as much of a correct answer as it can, and leaves the rest up to you. The cmd tab completion doesn't care at all about being correct, it will always give an answer, no matter what you ask for.

Lots of people on Unix systems prefer the much more permissive guessing zsh offers.

Hum... I can see how people would like zsh. It doesn't just guess at the first tab press, and that extension that displays all the alternatives before looping is nice. It's permissive but it's disastrous interaction is opt-in.

If autocomplete on IDEs were that respectful, I'd like them too.

I use zsh as the sibling mentioned to be honest. Giving me options is the best option