i think thebiggest problem with the jailer is peoples expectation
the fact that its morally straightforward, hes big bad and you stop him, which is normal fantasy archetype but for some reason alot of the lore people have been on a "is the jailer actually 5Head secretly the good guy. and blizz writers are just 1 dimensional and go , nah bad guy bad.
also we know nothing about him
why was the sigil taken? why did he rebel? what was the maw before the maw? al lof these would of been cool to explain and add depth and we'll never know because im 99% sure SL was cut short because why were those questions raised if they didnt intend to answer them originally?