Okay, so it's absurd to he able to swing your sword all day, but it makes sense that it takes you 24 hours to remember how you swung your sword that certain way the day before?
Ceaseless sword swinging being silly
does not equal "Therefore, martial dailies are the
only viable solution."
There are any number of ways systems could model fatigue, and many of them could be applied to both sword-swinging AND spell-slinging.
For instance, if one were to embrace the idea that hit points aren't (exclusively) meat, but are supposed to also cover fatigue:
All actions significant enough to bother tracking consume HP, representing the effort it takes to perform them. Swing a sword, lose HP. Cast a spell, lose HP.
Simpler things consume a smaller amount, more complex and powerful things consume a larger amount. A basic sword-swing costs fewer HP than an attempt at a fancy manoeuvre. A cantrip costs fewer HP than a Fireball.
In such a system, it would probably make sense for nearly
everything to reduce HP on a miss, to represent the effort required by the defender.
Obviously this system is far too significant a change to be the default approach, and would require a high degree of mathematical rigour from the designers to get the balance right. It'd never be accepted by the HP as meat crowd, and given that I've spent all of a minute inventing it there's probably numerous other flaws I haven't considered.
But I'm not a professional game designer. I'm confident that the professionals could come up with ideas at least as good, and probably better. Then the development team could work out the kinks.
But that'd require them to actually want to model fatigue in the first place, rather than perpetual-motion fighters and forgetful wizards.
I don't know, will they?
Like I said upthread, "uses a crossbow" is hardly an iconic feature of wizards in literature.
Well, there's Hagrid ... perhaps all these crossbow-carrying wizards also have pink umbrellas ...