I speak weekly with developers that tell me "oh, you made an admin panel. I could build that in a few hours. we don't need it." and they never do. They really can't. It's a tough thing to make something quick, reliable, and that gives you no headaches in the short and long run.
And, I guess the excitement is not just for building MVPs, but in general for how much things have evolved and that we have alternatives to copy and pasting forms and fields around.
I'm not going to say that everyone should use Avo. I believe that each developer vibes with some technologies. That's why we use ruby, PHP, JS, VSCode, vim, chrome, firefox, linux or macs. Because we understand them, think in that way, and push out great work with them. So yeah, if Firestore is your thing you should use it. I'm not pointing any fingers.