https://together.jolla.com/question/191235/official-event-sa...
It wasn't too bad, though the swipey interface made it a little to easily to accidentally call people when drunk.
Personally, I don't have a need to root or install alternative ROMs until well after the warranty expires on my devices, so I don't mind the current situation as much as some.
Source: https://motherboard.vice.com/en_us/article/yp3nax/jailbreaki...
At some point, hardware progress will be so minimal and devices so easy to manufacture that small companies can offer their own high-end phones and can build for them some years without really being much behind the competition.
When that happens, custom ROMs can really lift off and I don't think we're so far away. One or two more generations of smaller chips and better batteries. We're already at the point where the only innovation is adding more cameras.