When I read your post I stumbled over your disclaimer. Objective is difficult when you don't even have it leveled. I can read your implicit opinion about how NIN is far more complex than people think. A bit strange to compare it to stuff you only read. xD

NIN feels way too forgiving compared to MNK. I also think I can "slack" and still be close to NIN's ceiling damage. On MNK not so much (on DRG you just can't, hence the "fix").

Apart from that I don't think MNK and NIN differ much when it comes to difficulty to play they both have their things to keep an eye on to really max dps.

You compared mudra's to positioning for example. Mudra's are in the players hands where a position depends on the boss, tank, task you could have etc. Not a good comparison imho.