JacktheRabbit
Explorer
Rope Trick? DO you really want to make characters like Warlocks who are totally based around short rest abilities way overpowered compared to their fellows?
This is your personal interpretation of how to use those statblocks. Entertain the possibility that it's not a common one.
Right, okay. So we'll ignore the flavour for that *exact* stat block for a bit, and use another logical argument:
A 3rd level character has only just finished their basic training. A 5th level character thusly isn't far off. It's entirely reasonable to assume that if a fresh initiate is at level 3, a practised clergy would easily be level 5 or more.
I don't remember exactly where, I believe Mike Mearls said it. But you can also see it just by looking: Paladins don't affirm their Oaths until level 3, Fighters don't finish their specialist training until 3rd level, etc.
Not to stoke the fires, but where are you getting this from:
A 3rd level character has only just finished their basic training. (???)
IMHO, the answer is basically because those are all too good to be able to use at will without expending a spell slot.
It is something that was bandied about when 5e was in late development / initial release (I don't recall the exact timing) - the idea that levels 1-2 were effectively "apprentice levels", and that a character was only a full-fledged hero at 3rd level onwards.