I think it really depends on the therapist, and the client. You mentioned that you're still having trouble feeling safe after 10 months (I struggle with this too!) - in that case, the consistency is a good thing, isn't it? If your session changed times every week, it could (even if it were unconscious) give you the feeling that your T isn't really there, can't be depended on, and might make it harder to feel safe. This way helps you see that there might be an issue here worth working on, and it's not just the unpredictable schedule with the therapist.

But, that's really about the first weekly session. I don't know about the second one. I can see how it would still apply - maybe it could signal to your unconscious that your therapist can't be trusted if your second moves around and doesn't feel "stable" or predictable.

It's something to think about for sure.

Also, if you do end up with a 2nd appointment, I'd be really curious to hear if it helps. I tried that once (decades ago!) and it didn't help me. I think the T was acting in a way that made it hard for me to feel safe and trusting, so seeing him more often didn't change that at all. But it sounds like that's not the case with your T.

Good luck!