I think saying something like "the site is now more of an [X] type of site" is a subjective generalization, and boils down to how many questions of the type you have in mind are being asked.
"Should this be happening?" Well, while I agree that more focused and practical questions may be cooler, it seems to me what we get is about what people ask. I do not think that what-if questions should be banned or closed or made off-topic just for being what-ifs. If a question is too wide open, yeah that's a problem for this format. But I think the thing to do about that is close/edit/moderate those bad what-ifs, and then encourage or lead by example with other types of questions.
In looking at the most recent questions, though, I see a series of questions that all seem, at least from their titles, to be problematic to me, all for the same reason: They all seem to be asking for a creative idea for an answer, and/or include the silly assumption that there would be one answer to the question. This would only mildly annoy me on a forum, but on StackExchange with its weird Q&A rules and moderation, it's extra-annoying.
What mental trait or combination of traits could make a race well suited to warfare?
How many can I think of or invent for you? Probably an infinite number.
What would people on multi-generational ships wear?
Clearly, pink polka-dot pajamas. Again, how many ideas can we list?
What kind of technology would be developed in the process of creating shapeshifters?
Hopefully this question has already done major work narrowing its idea of what shapeshifters are and what "technology to create" them would be in the proposed world. The wording ("would") bothers me. It's fantasy, so you make something up. Again, could be any number of things.
What would modern IT look like if Silicon Valley had been completely destroyed in 1985?
Argh. Again, it hurts my brain because it sounds like the OP thinks this might have one answer. But really, it's asking for alternate histories to be invented for one event.
What effect would a known but lost precursor civilization have on religion and philosophy?
I hope they have a specific one in mind, and they just need some detail figured out. Otherwise, this is not only calling for speculative imagination again, but probably with many points of unknown. I'm afraid to even open the question to see.
Even if these are all narrowly scoped in the details, the titles seem to me all problematic, because they all sound like the OP is asking for a general answer, as if there would be one. If I had a question about what people would be practical to wear on my specific type of multi-generational ships, I would word it more like, "What type of clothing would be practical for my particular type of multi-generational ships?"
Moreover, just that list of titles seems like it's going to inspire people to write more questions that are written like that, which does look to me like an awful problem. I don't know how you all feel about handling it, but if I had the time and energy and were editor, I'd want to write or point to a guideline about broad questions and how to make them specific and how to word them so as not to seem like they were crazy broad, and then edit the crap out of the existing titles so that they were about the OP's specific setting. Because otherwise, I think this will probably just spread.