What's the point of the GoO warlock's ability to not use components on their illusion and enchantment spell if they're still required to use the Material component? With subtle spell you can actually do shenanigans without them knowing it's you since there's no component requirements at all, now you'll have to do an Alec Guinness obvious handmotion as you present your material for the spell and it will be obvious that you did it. (Unless you can just touch the material component while it's in your pocket since you don't require somatic component??)