I think the last point is of most importance. A lot of people don't like to feel negative emotion, so they act as if it's not there. This will almost always come up to bite them eventually. It's also causing a major issue in our society of singles who have all this baggage and unresolved residual feelings for their exes that they never bothered to work through before getting back out on the dating apps. It's honestly becoming an epidemic, in my opinion.
Your opinion is true, my friend. I always advice that after a break up, a person needs to sit back and analyse thier emotions. Check whatever caused the breakup and give yourself time to get over it before moving to another relationship. Else, you will pour out the pain of the past relationship into the new one.