Basically what the title says. Now, I understand that Lucy and the others were killed, and that the Psyker's do make the occasional appearance, but it's always some obscure reference (Like the Forecaster, let's be honest, the kid isn't just out there ready to be seen or interacted with. It took me 3 playthroughs to find the little bastard, and while the wiki and other sources do claim to say Professor Calvert was a Psyker, he really didn't show any psionic powers beyond mastery of machinery, and that can be chopped up to being neurologically connected to everything in his lab.)

I guess what I'm asking, is why such an interesting and cool thing from the older games was all but wiped out in the newer games. Like...why can't you get a companion that's a Psyker, or something.

I don't know, I just miss them, and the 'Psyker's' in F3 and F:NV don't really do them justice.

Well the Pyskers were made from FEV and the only other ones that I know of besides the Master's Psykers and the Forecaster are the Beastlords.

I also thought Professor Calvert just used tech and had absolutely now Psyker abilities, implanting a microphone into an unconscious person's ear and setting up a hologram in a cave isn't very difficult for a genius who's been alive for well over two hundred years.

I've never heard of these so I had to go and look them up and you are right, having one of these would be awesome. They really should add them back.
http://fallout.wikia.com/wiki/Psyker For anyone else wondering what this is about.

Well they should be rare, that even Forecaster was a Psyker certainly satisfied me.
So it's all about where it takes place. New Vegas is a bit too civilized for a Psyker to be at.
Could have had a Psyker slave at one of the casino's as entertainment but other than that I don't see where they would fit.
So yeah it'd be nice with more appearances from them but only as long as a handful makes an appearance.