I see zero trouble as long as it requires no additional identification, no additional payment, and no mandatory time limit for the sideloaded apps.
That is, fine by me. I can wait for 24 hours once in a few years when I acquire a new mobile phone.
Why would you do all that to install an app in a device that you own? It's bollocks.
You are thinking about it from the point of view of an enthusiast/hacker who wants to put their homebrew stuff on it. But this is also tightening around developers who may want to distribute their applications to lay users.