Hahaha, good point. Those opportunistic bastards! :p And good call, I've been thinking a lot about Tolkien dwarves. My current feeling is almost that dwarves shouldn't be growing crops or working with textiles at all, even though I find those elements of the game fun.
I was also thinking that other races would be interested in your finished goods, and perhaps there'd be a market for exotic, dwarf-speciality foods, but not surface foods that anyone can procure. This is probably veering off-topic, though.
As for the Mountain Home being a newbie tool, that makes sense! How I would like that to work is, by using a largely "outsourced" workforce, you could get a lot more done, but you would have less "ownership" of your fort. While it's harder to train up your own guys, everything you do would be yours. Simply paying salaries doesn't cut it, IMO, that's too... I dunno, superficial. The player would still feel like they're in charge, rather than feeling like a tool of a larger empire. The mandates are certainly better, especially if you sometimes had to redirect your fort from what you want to do to fill them.
That could be a bit of an annoyance, but I think that should be the goal. If your highly skilled workforce is largely external, the price should the oppressing feeling of being under someone else's thumb.