I think it depends on how mentally healthy and stable the LSE is LOL. I mean, obviously, but crazy LSEs are crazy.
If you think about it, a Quasi-Identical is almost like a dual in a way. Almost. Because if you have exactly the opposite values in the same order of strength (like a flipped over negative of you), then it’s easy to divide resources and things to focus/work on between the two of you. In some ways it’s better than duality because if you mess things up it’s less painful and disappointing between the two of you.
I also think that it’s obviously going to be better if there is no power imbalance, just IME, because this is considered a balanced ITR. Things exploded between an LSE supervisor and I recently. I also had a bad relationship with my LSE mom growing up. But things are improving a bit with my mom now that I’m getting older, and with LSE clients and colleagues where things are balanced between us, it’s pretty good with them.