It probably wasn't deleted, but rather moved to the pinned thread with all the other posts of impatient players.

Also, as stated above, because the answers you seek are in pinned threads and news feeds that seemingly very few bother reading.

Because it's old and tired and no one has any answers to that question that you'll find acceptable.

patience.. check out this incomplete list https://screenrant.com/longest-development-times-video-games/

Probably because the answer you seek is in the pinned topics

because they dont want people talking about how slow development is

You'll be able to find it in your personal comment history if you want to reference it.