Having done both MDMA and 2C-E (mid 00s were pretty good in that sense), in various amounts, I'm not sure I'd agree (or disagree, really).

Threshold dosages had noticeable impacts in vision or mindset, but I didn't feel anything particularly introspective/exploratory. That wasn't until higher dosages, and only then I felt like it was a rollercoaster, in the sense of intense but very well psychologically attached to the rails. But then again, in those dosages I could hear the echo of my own voice with 15s delay, and just going to the toilet was an adventure full of unexpected events, so I'm not sure how a therapist can guide that either.

MDMA on the other hand softens everything from the smaller doses to the heavy ones, at least until the amphetamine edge starts to take hold.