I also wish rituals were more than just… the same spell, but takes 10 more minutes and doesn’t cost a spell slot.
I think how games that look more at the wider mystical legend/fiction world do this sort of thing are really cool. Like how Beyond the Wall moves a lot of general purpose magic out into the Ritual section, makes them far more deliberate then quick in-combat cantrips and spells, and adds a longer time/material requirement as well. They feel like actual Rituals.
Maybe when your wizard with Stealth proficiency sneaks around, he’s not just hiding but using his petty magic to place a veil of shadows around himself, or to make his clothes change color to camouflage.
As somebody noted above, this could be an interesting version of like warlock invocations. Maybe you could even tie it to spell schools / subclasses to give them more flavor? Extend prestidigitation flavored by your specialty and growing ability? "Veil of Shadows: As an illusionist, you can now gather nearby shadows to help blend into the environment. You may use your Arcana proficiency when making a Stealth roll" or whatever.