maybe I'm just in a curmudgeonly mood.
Our hope is actually that over time, you'll end up with this repository of discussions around problems/solutions for a wide range of use cases that you can come back to whenever you need help.
My take on Stack Share has been that it’s trying to just get just enough eyeballs to be a viable recruiting tool. I’ve rediscovered it a few times and each time I leave disappointing because I don’t really find anything helpful.
After the last time I bumped into it, I started considering creating something to address what I’m looking for above, but I’m not sure what would motivate developers to help build this body of knowledge that I wish existed. What do you all think it takes to rally developers around creating something like this?
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/