I have not run a controlled study, but I have shared topics here on this website that made it to the front page quickly and had a lively comment section and on LinkedIn the same was had very limited impression numbers. I did an experiment with an ATLRUG announcement where I did not include the URL and the numbers were slightly higher than one that did, but still not great. I have connections on the platform with relevant interests but its not showing it to them.

One thing that has always hurt me is I have never once in my career been on the traditional job market. I was self employed as a teenager and have always just kept growing and pivoting and growing. I have never sought or taken a job via the normal market. LinkedIn has always been a bit of a odd place for that mode of work.