There has long been two (probably more) factions within the MathOverflow community, of which an oversimplified description is this: some want to take the time to train new users, and some don't.
This user exhibits some enthusiasm and some vocabulary. However, the examples posted by the user indicate to me that considerable effort will be needed to develop this user into a productive member of the forum. I am willing to spend a little effort to indicate what is needed, but I can't spend enough effort to get this user to a level of participation that I think will be satisfactory.
Many of the people who vote to close I imagine belong a faction where maintaining quality content is more important than training new users. This faction is important, but also influences how the forum as a whole is perceived. I think your meta question touches on a deeper issue, that of what kind of set of services we want to provide as a community managing this forum.
Gerhard "Doesn't Have A Good Answer" Paseman, 2020.03.21.