Founder of StackShare here- it's not a recruiting tool and it never has been. Used for recruiting, definitely. Companies link to StackShare all the time in job posts (even in the Who's Hiring thread) to show applicants the stack they'll work with. But we don't have a recruiting product nor market ourselves as one so not sure how we come across as that.

Not finding anything useful could be a fair point, but it depends on what you're looking for. If you've been trying to get a better understanding about a tool that you don't know about, I'd love to see a better resource (I don't know of any). If it's a tool that you already know about then you could certainly make the case if you want to do a full deep dive, consumer-reports style. But again I don't know of a single place to go for that.

Regarding your first point, there's no shortage of online courses and tutorials to help you when you're entering a new area of development which often go into the tools aspect. Curious- why don't those work for you? Here's a good one for React that does cover tools: https://reactforbeginners.com/