The "threat" to get stuck as a Squire long-term is pure rumor mill nonsense that doesn't reflect reality.

Also, Squires get two powers.

And your last question pretty much explains why you have a hard time. You don't understand the point of Maran at all. Killing something good is literally the worst possible thing you can do.

That said, it's still stupid-easy to move on from it IC, with no real consequences.. at least for the first time or so.