"No autocomplete" and "doesn't show available functions" are a matter of bad defaults, rather than lack of capability. There are great packages for them availab

"No autocomplete" and "doesn't show available functions" are a matter of bad defaults, rather than lack of capability. There are great packages for them available, but even in core, there are OK options (ido-mode). I do wish that the core team would "bless" great packages and work towards bringing them into core and into the defaults.