I did some thinking about this elsewhere. Think about it this way - you get access to a large number of extra spells with ten minutes notice. Some of those are standard ritual spells, too, and if you have ten minutes you usually have 20. It allows the Psionic Soul to be much more of a toolkit caster than a sorcerer usually is, but with a very tightly themed set of tools. Then, the Mind over Body abilities reinforce that. Consider: This is a caster who can fly while invisible, without the sound of flapping wings. That's pretty damn powerful. Some of the combinations you can put together just with Mind over Body and Psionic Discovery are so good that I wouldn't be surprised if Mind over Body used concentration it this gets into a book.
I was thinking more in line with how they are using the new die mechanic. Getting Ritual Caster on them might be worth it, but it sort of leaves me with the same thought about damage, they just aren't built to be damage dealing focused, so I'm not sure why the ability at level 6.
I also doubt they will end up taking concentration just for that. Storm Sorcerer can do it too just off the top of my head. And at about the same level.
Also, flight is about the only consistently useful ability from that list, so I don't think the nerf would really be appropriate.
Well, lots of us.
Ignoring the VSM requirements/restrictions of spell casting is like ignoring opportunity attacks for melee, or cover rules for archers (the latter of which I realize many people do in fact do).
I get you, but the vast majority of the tables I've played at haven't cared. In fact, I don't think any table I've ever played with cared.
I mean, let us just take Charm Person for a second. Imagine someone walks up to you and yells "Ktharun tol suiule Vake Tul!" while waving their hands around. And suddenly, you remember they are a good friend of yours from... well it doesn't matter where.
Unless you are an idiot, you know you've been charmed by magic. You just have to, any guard worth hiring at a place more secure than an empty warehouse would know to look out for this.
And it just drags the game down for me and a lot of other people. Might be great for you to figure out how the bleep anyone uses these spells in any context other than a battlefield, but there are spells clearly meant for stealth or sneaky operations, and having to yell out a string of nonsense just breaks that story entirely.