I agree with the part about someone stimulating the relationship. Extroverts are not intimidated by rejection. They still feel hurt but they will say something, bring up the issue and create some "noise" around the issue.

I think the benefit of introverts is that they don't fuel the extroverts fire. Which can often be prone to combustion.

The one time I dated a passionate extrovert, our arguments were insanely fired up and borderline scary.

Every introvert would just not respond and let that shit blow off.