+1 I would very much prefer scrolls to be locked to classes the way core rules of 5e work for the same reasons @Temperance lists. Most importantly class flavor and uniqueness.
As for Revivify scrolls I think that's more OK if translated to some other thing that isn't a scroll. But here as well I'd prefer death to be more prevalent and harder to circumvent. In addition I think that magical item should have a cast time of 1min or more so that you can't just spam it in combat.
By higher levels of play most parties will include a spellcaster with some sort of revive spell on their spell list anyway so to me this mostly applies to early levels.
