You are so much spot on with this post. Nothing puts off more than someone on LinkedIn asking "When do you have time to have a call to talk about what I can do for your company?" or even worse: "Here's my calendly, pick the spot you would like!" Not to mention I am not a decisive person in the company, the largest choice I can do is whether I work on a Mac or a PC.
If I'm in a better mood, I ask them to send me some e-mail or PDF with what they have to offer.
I am adding your post to my bookmarks and will always reply to such messages with it.