Why aren't more SaaS apps built using PWA?

There are a lot of indie devs and even startups that are building SaaS apps on app store and google play store.

But it sounds like an absolute headache.

First of all, the approval process is long, and quite hard (i've heard, never done it)

And Appel takes their juicy cut from all your sales.

I just do PWA for my websites, it's basically the same as an app.

Is there a downside to it i'm not familiar with?

Why aren't more entrepreneurs doing this? Is it because of the exposure on the App Store it's all worth it?