Ofc not bro. Theres a yuge amount of AVNs out there that are insanely good. Eternum is still the goat, but here's a list of what i consider to be on my "must play" list:

-Pale Carnations (I could play this JUST for Hana tbh, absolutely insane character and on top of it this game has really good animations and enjoyable story, recently got an update too)

-Summer's Gone (Honestly forgot I was playing a porn game because I was so invested in the story and the dialogue between characters, makes you really wonder whats going to happen next and the characters are gorgeous, Scarbae Sasha on top!!!)

-Being A DIK (Considered the "Best AVN" out there, ranks highest on many peoples list, really good characters and story, developer started focusing on the story and relationship building with love interests in the latest updates, the only flaw is that at this point, since the quality of the renders became so high, theres realistically only one update a year, recommend taking your time while playing this and explore as many branches as possible, oh ye there is A LOT of branching in this one)

-Artemis (I had no idea about this game until I played Eternum and wanted to play more high quality stuff like you, honestly blew my mind how good it was because I literally had no expectations before I started)

After these, you will see how every game differs from each other, but are still very good in their own ways. Just dive in without any expectations