Personally, I think it makes much more sense to have made a blockchain proposal, and made everything else a tag on that site. However, that cat is long out of the bag.
OK, confirmed. We do need our own StackExchange network.
This is an example of the How are transactions feeless for end users on eosio? question. Our most upvoded question in our proposal.
It was downvoted because "it doesn't seem like it has anything to do with programming". So, as previously mentioned, there will be questions for block producers, Dapp developers, Dapp users, etc, and they do not fit in the StackOverflow page.
I expect that questions are going to increase after launch, so better be ready with a better system in place than a tag.