Just a note: plane shift requires a tuning fork made from a material from the plane in question. Obtaining such can be a real pain if there're reasons why you wouldn't be able to get one despite what's printed in the rules for a spell component pouch. For instance, it's a demiplane created by an enemy spellcaster and you have no way to get material from said plane. Eschew Materials would allow you to go there, whereas it's unlikely a DM would allow you to do so with just a spell component pouch. Yes, this is Rule 0, and yes, it goes against RAW of the pouch. It's still a point to be made, however.