I don't know much about most of the guns you mentioned, so I don't know the answers to your questions. I've sometimes had simular thoughts about their Mini though. About all I could come up with is that they looked at a couple of existing designs, kept some features, modified others, threw in some of their own....and then set-about seeing just how cheaply it could be made and still function reliably....which seems to have been the main criteria. Well that, and how it looks...because people do buy what they see, eh?....and after all, it IS a cute little rifle.
Unfortunently though, accuracy never really entered the equasion. Leastways, not untill lately. Still though, as accuracy 'n constency goes, even with it's new "tapered barrel", what the consumer is getting could best be termed "an OK rifle", not so much a "good rifle".
And that's coming from a guy who owns one....a 582-series in fact....which I consider to be "closer to good"...but still..."no cigar".
DGW