> Recruiters contacting me with “perfect fit” position in languages not on my profile.

You're certainly entitled to your opinion, but not everybody is bothered by that. Most languages popular nowadays (C#, Javascript/Typescript, Java, C++, etc.) are popular partly because most devs can jump between them pretty easily.

Definitely not defending Linkedin, though. A coworker of mine writes posts about his stance on abortion. I don't know what Linkedin's policy is about it, but it's super awkward, and I just stay far away.