Don't forget the reach for Probe is 5m, so you don't have to touch the person being interviewed. It's difficult to do, however when my psionic character used, it was for interrogating prisoners during a jump. So a whole week of interviewing. Not that I found out anything useful.Life Detection is, by far, the most frequently used ability by the psion in my group. She's never bothered with a psionic "attack" given how ineffective they are. She has a good skill in Teleport and Telepathy, but lvl 0 in Awareness and Clairsentience. Even with a decent by normal skill standards bonus in Teleport, it is unreliable. And the low skill level in Awareness and Clairsentience means those are basically 50/50 to pull off. Succeeding on a psionic assault would be a fluke.
Most of the Telepathy abilities I rule as being chain skills for other skills rather than doing a lot on their own. So Telempathy, Suggestion, and Read Thoughts boost social/investigation skills. Like Deanne Troi more than Emma Frost. And Probe is basically about as subtle as a Vulcan Mind Meld. That makes them useful without dominating play.
The difficulty is 12, but by taking time you can reduce it to 10 and because the first attempt of the day is at +2, then all I needed to roll was an 8. The biggest risk was other Travellers realising what I was doing!