I’ve read all the threads and all the discussions about indexing, but I still can’t understand why games that have no gameplay, no description, no screenshots — basically nothing — get indexed immediately, while I’ve been waiting for a week
I doubt that. Else you would know that 7 days is nothing and that support will not answer such requests and if they do, that it will be more than 4 days. You also did not read the community message board rules.
So why can’t itch offer proper moderation?
That costs money.
Also, Itch does not see it is a priority to advertise games. Your page is fully operational. Itch believes developers should do their own promotion. For that you do not need to be indexed. Indexing is low priority. Things like malware, ddos attacks, pay out issues are a bit more important.