This is cool, but its hard to make a game engine full featured enough to be worth developing for. Have you thought about making this an addon for another engine like Godot or Bevy? Godot in particular is a nice engine to develop on, but the multiplayer support could be improved.
You are right. I am insane. I've had many existential crises about this exact issue over the past 3 years.
I just had a very very particular idea of what I wanted to do and nothing else would do. Making automatic multiplayer was only half my mission. The other half was creating the perfect first programming language. (I talked about this in another comment: https://news.ycombinator.com/item?id=44001047 )
I would love for Easel to inspire other game engines about how multiplayer could or should be done. But I just can't personally do this any other way. It's like, sometimes I don't know if I chose this project or it chose me.