Culture
Tyrannized chooses either Defiant Will or Saving Face, not both. Scars of the Scourge's energy type is determined by GM based on origin.
Destiny
Excellence is removed. Alternatively, Excellence's "nat 1" Source of Inspiration only applies to proficient skill checks.
Berserker
Versatile Exploration is moved from 3rd level to 8th.
Creatures get CON saving throws at the end of their turns to end Furious Critical effects without existing saving throws; DC equals the character's Maneuver DC.
Juggernaut is removed from core Berserker features, and added as a 3rd level feature to the Dreadnought archetype.
Tempest Archetype's Whirling Winds doesn't grant cover against adjacent attacks. Touched by Thunder's damage is 1d6, 1d10, 2d6, 4d6.
Maneuvers
Stances end when you rest, short AND long.
Stunning Assault has two fixes; A simple, B nuanced:
A. the only attacks affected are the ones with your attack action/extra attack (so bonus actions, reactions, etc aren't also Stunning).
B. a creature that fails is rattled. rattled creatures that fail are stunned. (this makes teamwork a possibility, with other PCs using rattling effects to set up for a stunning assault).
Defy Magic gets a buff- spell attack rolls are very uncommon at mid and higher levels. It works against magic targeted magic (non-AoE), including Save spells (such as hold person). If successful, you get advantage on the save against the spell.
Gaze of Conviction gets a rewrite (as it is, it'll force a wizard to run at you with their staff/dagger until you've hacked them to pieces while all your friends also beat on them):
You stare down a creature you can see within 30 feet, and if it can see you it makes a Wisdom saving throw. On a failure the creature is compelled to focus its aggression on you. It must target you with single-target features and attacks, and include you in multiple target/area features. The creature can't willingly move to a space that is more than 30 feet away from you.
The effects of this maneuver end when you target a different creature with an attack or feature, if the creature is unable to continue its aggression against you, or if you end your turn more than 30 feet away from the creature.