Some questions here are aimed at times or events known only or mostly from archaeological evidence, and some frowned upon asking such questions here. Now there is no good alternative so it's completely OK, but wouldn't it be nice to have Archaeology.SE as an alternative for such questions?
I would like it, just because it would remove a lot of questions from here that we currently allow because there is no Archeology site for them to go to. However, I doubt I'd participate in it myself.
There would be a fair amount of overlap though. If nothing else, were such a stack to come into existence, we'd probably end up spending a lot of time migrating questions back and forth. A lot of times people come here and ask what they honestly think are history questions that end up having archeology answers. For example: Which is the first genocide?
Also, many questions about the bronze-age cannot be properly answered without using a mix of both History and Archeology (and sometimes Linguistics).