I've owned several Mini's over the years. I currently have three (180 series, 185 series, 189 Series Mini Thirty). The 185 and 189 I bought new, many years ago. All three have served me well. And I wouldn't change any of them. At some point, I'll pickup the latest 16" Tactical. I also own several small frame AR's and a couple of large frames that I've assembled. All of them are very different from each other (ranging from lightweight carbine to my version of an SPR). My go to rifle though, is my 185 Mini. I've put many rounds through it, and I'm very comfortable with the rifle and how it shoots. And it eats everything I've fed it.
With all that said, I personally would like the "option" of a heavy barred Mini from the factory. I'm not talking 1" bull barrel, that would be restricted to the bench because of weight. A barrel profile like what's being used on the 300 BO would be a great place to start. A .223 Wylde chamber, 18.5" 1 in 8 twist, threaded barrel. With a gas block that accommodates the larger profile. Which would give better consistency out to the longer ranges as the barrel heats. Does it need to be sub MOA @ 100 yards? No, it doesn't.
Just like everything else, it would appeal to some and not to others and that's ok. The platform is worthy of such offering in my opinion. And I'd buy one for my toolbox.