Developers pay money to access. In the ticket, the developer mentions paying the $99 a year. That's not trivial.
Apple is literally in the top 10 largest companies in the world for several different measures. If they're achieving those numbers by giving the ole F'you to developers, that is a problem. Getting locked out of a distribution platform for 1~3 months, in today's world can cost thousands or even tens of thousands in sales even for small developers.
There are no other options for Apple. You can't install untrusted apps like you can on Android (which is still a huge pain and which no one does).
I almost feel like someone like the EU or California needs to mandate that both Apple and Google allow individual users to add 3rd party repositories in the same way you can on most Linux package managers. They can throw up a big warning about device security if they want, but unless there's regulations around it, there's no way for the average use to actually have control over his or her device.