INTPs can exert energy and have strong emotional connections, but with just a few people. Otherwise you'll overwhelm us, so that is accurate.I had to re-read this thread, but for me this is probably the number one reason why a relationship with an INTP wouldn't work out. I don't even see this so much with ISTPs.
I'm basing this on the four INTPs I know IRL and from what I see on the forum. Some of the best words that describe me is synergistic and exergonic. I release lots of energy, I've tried to change that I try to blunt it but it's just what happens. The INTPs I know seem so retiring to me, like they should be in some quiet library pondering the secrets of the universe that I have no doubt they will eventually figure out or sitting on a rock next to a tranquil pond. My INTP friend is the one who introduced me to MBTI and she said I scared the hell out of her when we first met. We were roommates in college and I was the first one in our apartment. While I was away at work, she moved in and went out to run errands. Then I came in and saw someone was finally there and was sitting on her bed when she came in and she alleges I assaulted her although I don't really remember that.
My energy and apparent lack of INTP energy makes me feel like I have to squelch essential parts of myself to keep from discomforting them which eventually ends of discomforting me and I'll begin to act out. Also having a strong emotional connection with another person is important to me and I like cogitating about relationships in all their various forms and talking about them and thinking of ways it can be better and it seems like this just tires INTPs out. It seems like INTPs have problems sustaining that energy and it would be best to be with someone who doesn't require so much, so I guess basically someone who is lower maintenance. Even having to explain why it's important or why such maintenance needs to happen turns me off because (and here I am thinking with my Fe brain) it seems obvious why it needs to be cultivated and maintained.
I feel like it's easier for me to swing to the INTP side of things for an INTP to swing to mine. I just feel like a lot of resentment would begin to simmer in the relationship and it would just end badly if I constantly have to guide someone through the relationship jungle.
In conclusion: we better be sleeping together for you to get all of us.