Its actually a pretty serious problem because wotc chose to make short rest classes with the same abilities as long rest classes or with abilities equivalent to those of long rest classes and llthrew up their hands leaving it to the gm to balance the two. There are also classes who are hurt by it with the easiest example being the artilerist artificer who is designed as a half caster with a 1/long rest 1hr duration turret that takes a spell slot to recreate with zero short rest recovery abilities who is literally depleted of a limited resource for the short rest classes to nova>rest nova
As I mentioned before, main problem of "short rest" is that is not really short.
1hr is too long for that kind of mechanic.
5min rest from 4E was a much better idea.
99% of the time, if you have room for a 1 hr rest, you have room for a 8hrs rest.
So we have few solutions:
1. Make all classes work from only long rests.
2. Make short rest SHORT!. 5 mins.
3. Make all classes work from short rests
4. Make short rest really short. 1 min long, but limit it to proficiency bonus times per long rest.
also return 4E healing surges, instead of HD healing.
add 3.5E reserve feats back, so casters can hold on spell slots for minor at-will magical effects.
or make make some portion of spells have different effect depending on how much power you are willing to take from the "spell slot"
I.E.
Fireball
8d6 + 2d6/spell level above 3rd fire damage in 20ft radius. 600ft range
casted this way slot recovers after long rest.
4d8 +1d8/spell level above 3rd fire damage in 10ft radius. 150ft range
casted this way, slot recovers on short rest. whatever duration of that rest might be.
4d6 + 1d6/spell level above 3rd fire damage in 5ft radius. 60ft range
spell slot is not spent.