Again, it's not that they need to jailbreak it. It's that jailbreaking shouldn't even be a thing. Locked down operating systems are for DVD players, games consoles and other peasantry. For your specifics, see everything that people got around aegis to do.
Doesn't really matter. I like what I like, and I don't judge the superiority of an OS based on its popularity, nor do I need the world to comply with it.
I expect a bit better from people who know their way around the insides of a computer though. It breaks my heart when I see someone who used to enjoy tinkering with things give up and fill their lives with Apple stuff.
So why did you start this discussion?
You declared BB10 to be 'superior' to Sailfish, then retreat into different strokes when that is challenged? It's always going to be hot in that kitchen.