I just don't care for being pigeon holed into basically only giving attacks to certain classes because of those edge case interactions that are goofy powerful.
See... I don't get this at all. Lemme go down the list:
Adept: Uses Rapid Glint maneuvers on the attack you give to get out of danger spots, or rush into combat, or uses Mirror's Glint to inflict penalties or steal stuff.
Bard: Uses Vicious Mockery to apply disadvantage to enemy attacks off their turn or casts Message to get off a warning, or casts True Strike so when their turn comes around they can gain advantage on an enemy.
Berserker: Adamant Mountain strikes to fling some guy off a cliff, Tooth and Claw to reposition or chase down an enemy, and Critically Hit really hard when you've got even more attacks in a round.
Cleric: Spare the Dying in a clutch moment, or Sacred Flame, or Pestilence, or Guidance...
Druid: Produce Flame, Pestilence, and Shillelagh either deal immediate damage or give the Druid the chance to prepare for melee before their turn.
Fighter: Literally any type of combat maneuver which makes them super flexible for movement with attacks, knockback, imposing disadvantage, etc. etc. etc.
Herald: Divine Smite on a Combat Maneuver. And with Spirited Steed that can be a lot of free movement. Add in Resistance, which is a useless cantrip most of the time but being cast as a reaction can be pretty great, True Strike, and Altered Strike and you get some strong options.
Marshal: ... probably won't ever happen, let's be honest.
Ranger: Like the Adept, but also plenty of Pew Pew if they're an archer. And at level 9 they get free Whirlwind Strikes or Missile Volleys for an AoE reaction attack. Pretty great!
Rogue: Sneak Attack Combat Maneuvers. Or just combat maneuvers if they're not able to get a Sneak Attack Off. Still pretty useful.
Sorcerer: NOW we're getting into it! They can cast any of their cantrips and change their cantrip's damage type on a whim, making them swiss-army-knives of arcane damage. Add in stuff like Minor Illusion to create increased flexibility in what they can do.
Warlock: Eldritch Blasts of 4 different flavors, damaging cantrips, Minor Illusion, and True Strike.
Wizard: Sorcerer part 2, Electric (Pyromantic?) Boogaloo.
... once you include combat maneuvers into those reaction-attacks the Marshal suddenly looks a heck of a lot stronger and more flexible.
If only they could also give someone else 1-2 exertion from their own pool when ordering a strike. That would make them pretty crazy. Or even just -grant- someone 1 Exertion since Cantrips don't cost the recipient anything...