There's no hill to die on. This not a sticking point for WotC, since they agree with us that Psions/Mystics don't need components. If they make one and release it, it will not require components. There may or may not be visual, aural or scent displays like 3e, but those are not components.
Just to quote myself, since it was apparently missed:
"Classes change. What goes into a class changes. What is the "important part" of the identy of a class one day is on the cutting room floor the next. Insisting that X MUST be part of the class just because that's the way it was before doesn't really hold a lot of water when you look at 5e and the evolution of virtually every class over the course of various editions. Other than maybe, and very maybe, a fighter, none of the classes look much like they did before. "