billd91
Not your screen monkey (he/him)
From a meta rules design perspective, is it a "healing spell"? Again, I would say it's a flexible utility spell that can be used to heal. Or mitigate damage by removing a character from combat. But it can be used for a number of other purposes, such as hiding and spying.
As a legacy spell, rope trick was one of the first spells updated. It appears as early in the playtest as packet 2, the first with character creation rather than pregens. However, for most of the playtest it was unchanged, even after short rests went from 10 minutes to 1 hour in packet 6.
When the spell was designed for 5e, having to find a "safe place" to take a short rest was less needed as 10 minutes is a relatively short period of time. People felt comfortable doing that anywhere.
Pulling back the curtain, the spell existed in 1e and 2e (in the PHB) when there was no short duration healing. The "design" of the spell has nothing to do with short rests and everything to do with replicating the Indian rope trick illusion: https://en.wikipedia.org/wiki/Indian_rope_trick
You'd probably have to go back to the player at Gary's table in the '70s to ask if they designed that spell as a "healing spell" and a place to rest and recover, or if they just wanted to do the cool magic trick they had read about...
As rope trick was a wizard spell, it was potentially planned as a way to escape combat and avoid taking additional damage. Low level wizards were fragile. But the long duration (20 minutes/ rounds of combat per level) and given it's a 1e spell probably created by Gary's players for his various Greyhawk campaigns, mean ambush tactics were likely part of the original design. You cast rope trick, hid, waited for a guard to pass, and then snuck past for the treasure. Or dropped down and killed them before they could fight back. It was a spell to negate combat and bypass the danger and get to the treasure.
The origin of the spell back in the 1e days isn't solely relevant considering the spell's evolution. Clearly with 1 hour/level starting in 3e, it becomes pretty effective for resting and healing for parties. While it has always had relevance for hiding from a passing threat, it's probably even more consistently useful for getting into a safe place to engage in some healing away from prying eyes.