Love, as I view it is not something that can be easily defined.

That just means that you don't have a well defined concept of the term you are speaking about. I would guess the same is true for most Lesswrongers for most emotions.

But as far as your link goes, I would predict that most people on LW won't be receptive to that kind of talk. I would be very surprised to be proven wrong.

As for emotions... why would anyone dislike the joy of figuring things out? the post flow feeling of accomplishment?

If you want a fancy answer: Second-order cybernetics.

A simple answer would be because you can't feel a strong emotion while wearing a mask. It requires you to give up control and get out of your head. I mean something specific with the phrase "get out of your head", but I would guess that a good portion of LW don't know exactly what I'm talking about and I know of no way to make it clear via this medium.

I could probably come up with a bunch of more reasons if I would invest time.