What were the two biggest failings of 4e D&D and how does 5e D&D fix that?

Comment What were the two biggest failings of 4E D&D and how does 5E D&D fix that?
Biggest issues we see from players – combats run too long and characters are too complex. 5e slimmed down baseline complexity and streamlined combat to overcome those two issues.from discussion AMA: Mike Mearls, Co-Designer of D&D 5, Head of D&D R&D.

Do the tortles in The Tortle Package receive Unarmored Defense benefits from Monk and Barbarian classes?

Rules that only toxic players hate are good rules