It's hard for an open source community to build features that compete with a commercial offering like that of Microsoft (or Borland in the 90s.) And the reason

It's hard for an open source community to build features that compete with a commercial offering like that of Microsoft (or Borland in the 90s.) And the reason for that is mostly down to fragmentation: the vim guys are doing their thing; the Emacs theirs, etc. Now focus that energy into a singular project like a Language Server and the payout is likely to be many orders of magnitude greater.