C-f SHOULD autocomplete in VI mode

[txtyash]

Please map C-f or C-e to accept auto suggestion in vi mode. It is a terrible
terrible experience to go back into normal mode and press $ twice.

[faho]

C-f is an emacs-ism. It's pretty clearly not a vi-thing, so it shouldn't be bound in vi-mode.

If you want, bind it yourself:

bind -M insert \cf accept-autosuggestion

[krobelus]

Also try fish_hybrid_key_bindings