I posted about this on the Questions board yesterday, but figured I'd add an Idea to see if others would like the same functionality.
Right now, more than 10 expressions aren't allowed due to: 1) wanting to avoid performance issues and, 2) wanting to avoid potential bugs.
The more I think about it, I'd like to be able to judge the performance of my experience myself.
I don't know about the bugs issue; I'd certainly be upset if an experience I built was irreversibly impacted by bugs, so maybe this just isn't viable based on whatever was causing the bugs during Esri's testing.
I can definitely imagine putting 10 or even fewer complicated Arcade expressions on a page and having the page slow down due to that. At the same time, I have a use case (see linked thread) where what I'm returning is very simple, but because I'd need to do it more than 10 times, it's not really an option for me.