Dude was probably being set up for an arranged marriage by his family, which can potentially pair you with someone you do not share any interests with or even attracted to in the first place. With that context, it kinda makes sense that he wants someone who at least shares something similar with him, and I guess linkedin is one way of finding out (in his mind).
Yup. What they basically said is that their parents do a good job of finding a good match, and both parties try to make it work. That last part is the biggest component of a successful marriage IMO, most problems can be resolved if both parties are interested in resolving them and willing to sacrifice for the other.
I still very much don't like the system, but it's not as bad as I thought it was.