Yeah... That is a strawman. But it's also just so... blatantly small.I don't see this as a big problem, becuase when that happens full casters don't have enough turns to use all their slots in combat anyway unless they are low level AND it is a longish battle. There are very few fights that will last long enough. Even a 5th level wizard has 9 slots, so he cares if he has 5 or 9 when the fight is only generally 3 rounds?
Further if you are fighting 1 fight a day with no short rest, 4, 5 or 6 battlemaster maneuvers is still a lot to use in that one fight unless it is unusally long. You can force use them no doubt, where a wizard probably can't actually use all his even if he tries to waste them. But that is not really relevant, because the 7th-level wizard who goes to bed with 5 unused slots left over didn't really do anything more spectacular than the battlemaster who goes to bed with 1 dice.
To be honest I think the 1-encounter a day while traveling dynamic favors the EK and AT more than any other class/subclass. Those classes come to the fight as a full fighter or full Rogue, with all the fighter/Rogue abilities while still having more spells than they are probably going to use anyway. You can add the Paladin and Ranger to that but their spell selection is not as good.
That Warlock at level 3 has 2 spell slots per short rest for an average of 6 2nd level spells, more or less, per day. That Battlemaster fighter might have 12d8 he can add on, 1d8 per attack and 1 attack per round, but I was -explicitly not including the use of subclasses 'cause the Warlock gets those, too. On TOP of those 12d8 the fighter can put out, once per round that "Equate" to spellcasting in your eyes.
With the Battlemaster getting a couple of short rests, he can spend 6 dice in 3 rounds across the day (Action Surge) but that still isn't as much as the Warlock can put out.
Meanwhile the warlock also gets telepathy, or temp HP every time they land a killing blow, or the ability to terrify and/or charm the people around them. Or the ability to pick a person once per short rest and crit on a 19-20 with proficiency bonus to their damage. And their Pact Boon. All on top of their spellcasting and their Cantrip doing pretty near to equal damage to the fighter's melee or ranged attack.
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