I'm using Moodle 3.5 with theme adaptable.
If I have understand well, they have already removed it from the core (that's why now it's a plugin), and it probably going to stop working in 3.7
The problem is our users really don't like the "new" (introduced in 3.3 ?) myoverview so we kept the "old" one while we can and we will change when it's will no longer work.
To make it really clean, I should have try to change more code and i don't have enough time for it now (and this code is probably going to garbage in something like 1 or 2 year, so it's not worth to spend more time on this just to go around an "hacky" step (a working one actually))