in EY: You are aware, that the chazon ish was speaking to people who have a much different dating system than do we. It is obvious that nobody is going to feel chemistry after 2 dates, which is when the community he is speaking to is thinking of getting engaged.
And correspondingly, the absence of chemistry after 2 dates does not signal anything wrong with the relationship, so the only question then is if you are willing to jump in knowing very little–which the chazon ish’s community was accustomed to.
I think it is very different in our system (depending on the who “our” is), where we date for a more extended period, and the expectation is that you are developing a relationship before the engagement. In such a system, I personally think the absence of chemistry is notable, since I would expect it to develop.
I personally once dated someone for an extended period of time, and ultimately broke up for this reason, and I don’t regret it at all.
But not all situations are the same. Sometimes it can just be that the couple doesn’t really know how to act towards each other in a way that will develop a relationship, and that is why there is nothing. So I’m not comfortable giving advice on this.