I’m not really super involved here but I’ve been talking about tables a lot on this Discourse over the last year or so and - while I appreciate your enthusiasm - I don’t think you should be expecting anything about tables to become part of core MD - there’s many really excellent implementations of tables that already exist that are not part of core because tables aren’t seen as necessary in all cases, so it’s classified as an extension that communities using CommonMark can add without it being there if they don’t need it.
There have been discussions about adding tables as core since 2014 at least and (from my understanding) there’s no general interest in adding tables to core.
There’s a related discussion about exactly this here.
So, my understanding is, while you’re welcome to create an extension for this purpose, please know that’s as far as it’s likely to go. 