Now that I think about it, you're right. There are hardly any hetero furry games with an actual furry main character.
This has only been the case since the late/very late 2010s. I can't give an accurate number, but the vast, vast amount of furry H-games before that were Anthro X Anthro. Though at this point we're talking primarily flash and text-based experiences, and a very, VERY limited number of VNs. Even early H-game bubble it was primarily Anthro X Anthro.
I find the human in an otherwise furry world thing to be a little trite.
Obviously your personal opinion, and I'll agree that Portal Fantasy/Isekai suffers from major issues, but to me, it's the furthest thing from trite possible. Human X Anthro is one of the most consistent times I see writers actually focusing on the differences between species beyond some meme references.
Why? Interspecies is already a major focus of furry work. Alienating an entire species like just comes off as the horrid misanthropic view that completely tainted the fandom in the 2000s.
Otherwise it feels like it's made for people who only want to dip a toe in.
Not to be accusatory, but this comes off as plain elitism.
"You aren't enjoying the fetish correctly"
Anyway. This definitely isn't HMOFA games. If someone was to "stick their toe" into it, they'd play a game with a primarily human and/or monster girl cast with one anthro in the cast.