I used to have an app in the MAS but recently removed it and is using Paddle instead.
There are so many things wrong with the MAS.
Sandbox is the biggest complaint I have. I can understand it with the iOS to some degree. At least there they are constantly providing new features and hardware changes to help apps keep being innovative.
To give an example of the Sandbox issue.
We are using AppleScript for some of our logic in the background. Because of the Sandbox every time AS is used a little gear pops up in the top menu of OSX.
This started with Yosemite. But worse than that. The implimentation of this security measure was completely sloppy. The gear didn't just appear it also rearranged the top bar icons and I of course got a horde of users complaining. We tried many things to solve this but had to finally give up and just offer MAS users to switch to our non-MAS version.
You would think that at least people would be able to turn off such a thing with apps they knew were ok. But no.
Furthermore reviews can really make you or break you. For a long time we had good reviews because I spent a lot of time making sure people understood why the spinning gear was there. But after a while one star reviews started appearing and we had no way of mitigating that or contact the user and tell them they could switch to the non MAS app if they had that issue.
And so I finally realized that if you want to actually do any innovation with your apps and built a proper business MAS is not for you.
I am beginning to wonder if there is room for an alternate App Store based on the the Developer Certificate or some security setup open sourced.
Anyway. My next product wont even be going on the MAS. It's simply not worth it. It's just a distribution channel for Apple to show their latest features (the only way you get featured)