I’ve been doing a little bit of research for a potential target realm … and this is how much attention Blizz puts into connected realms. One of the realms I have a character on, but haven’t played in a while - I just couldn’t find it on the wowprogress site. After some digging, it turns out that it was a Connected realm … and not only that, but in August 2020 it appears it was connected to another group of connected realms … was announced as such, was stated that they would be changing the forums to reflect that change … but then they never did. It’s like someone came along and told them “drop that … ignore it” … and they’ve never been back since.
If they couldn’t be bothered even merging a couple of forums together … they’re not going to bother connecting entire realms.
In September 2020: ✨ Realm Connections Update Thread - #10 by Thyvene-2505
“We are planning more realm connections for low-population realms, and we will post a new notification like this one next week.” - then it was unpinned and ignored.