Makes sense to me tho ...
Power level difference between certain levels in DnD is HUGE and level 5 is prime example. :-/
Damage for most meele classes and cantrips is effectively doubled ... casters get another level of spells ...
I bet i dont need to repat all the reasons you know them well enough, since we are using them as reasons for implementing level 5 to Early Acess.
People wanted ballance ... this is how you get ballance.
Caps are not popular option ...
But you cant argue with their effectivity. :-/
(I shall return later to react on CMK ... that will require quoting and that is pain on phone.

)