I really wish I could remember where the detail is. Looking at the PHB, I don't see it called out, either way, in either the Classes or Spellcasting chapters. About the best I've got is to say that it came up during a discussion on whether psions could be done as a subclass of sorcerer and related concepts. My personal feeling is that a really great version of psion could be easily achieved with a sorcerer subclass and spell points by just running with the idea that the psion "casts"
firebolt by pointing at the bad guy (S) and saying "Burn, bastard!" (V). But, someone pulled out a "you've gotta use the same components" reference.
Regardless, if it's officially open to interpretation, that's awesome. I've got no problem ignoring a straight jacket like that, at my table, but I'm happier if the jacket isn't put on.
This subconversation probably qualifies as white noise, though. If I was absolutely correct about the RAW, even I would just say, "OK, that's nice. I'm ignoring it."