I haven't had any opportunity to try a barleywine that wasn't my wash going into a still, so you're right on that one. That said, there's fairly limited profiles to a lot of those types of beers.
IPAs do have a lot of variety, and all you have to do to change it up is use different hops. I don't love IPAs, and I hate that they're all I see in beer aisles, but I also don't shop beer very much so whatever :)
Flavor nuance. I don't like hopsy beer myself, but there's a LOT of different profiles out there. I've even found a few IPAs I liked.
That I'll agree with. Not a lot of drinkers respect the mashbill anymore.