[MtAw 2e] The problem with Mudras
So, when you create a Rote, you encode it in a Mnemonic to make it easier to conjure the Imago later. This mnemonic is a Mudra - a yantra associated with a skill. When using a Mudra, you gain a bonus dice equal to your skill.
I like the concept of Mudras, but I don't like their application: except for the dice bonus in spellcasting, there's no difference between, let's say, Occultism or Science for a Mudra, as in-game everything is translated as a simple gesture, and, mechanically, the choice between one or another is bonus dice.
And I quote the book here: "Mudras come in many forms — Buddhist Libertines may use zazen, while the Arrow may tense specific muscles in a set pattern, and Guardians use specific rhythms of walking and representative hand gestures." This is really interesting, as it could incite a lot of creative stuff, but in the end, the skill you chose has no impact on the spell except for how many dice bonus you throw in.
The only other time the skill is relevant is when learning the rote from a teacher or grimoire, but even then, my point still stands: the skill simply becomes a gesture and a bonus dice instead of shaping what the spell is. When creating their own, players will just choose their highest skill for all rotes, because why wouldn't they? Rather than being symbolically meaningful for the spell (as all yantras should be), the skill you pick is just a dice bonus.