RE: What is the most useful potential feature which Emacs lacks? A: Autocompletion

[Drew Adams]

To be more clear:

My purpose in mentioning what Icicles does wrt
incremental completion ("autocompletion") was
to suggest features that can be useful in this
context - food for thought - not to solicit
use of Icicles.

IOW, vanilla Emacs might also consider such
features, or similar.  And none of what I
described requires the use of the minibuffer,
even if that's what Icicles uses.