I also have found the recruiter email to have gotten a lot better recently. As an experiment (as my startup is hiring - I wanted to see what the candidate experience might be like these days), I expanded my LinkedIn profile to trigger as many recruiter-friendly tickyboxes as possible, expecting a deluge of spam. I got about five messages, all fairly well crafted and personalised to some extent. Honestly, I get more spam to my email address than InMail these days.
I also ran a fun experiment where I set up another LinkedIn profile nearly identical to my own, changing the name and gender and writing a very terse summary for each job. Boy, does he get a lot of random spam. I wonder if by writing a more detailed description of my skills/experience/contributions, I somehow generate better inbound messages...
Speaking to the point about "what would you export", I definitely have contacts who I am only connected through via LinkedIn; a key example being former colleagues whose personal email addresses I never got, and whose work emails I barely remember. I think it depends on the kind of network you have built there, though. The more work you've put into your LinkedIn connection pool, the more you want to export it.