You may not like it, but customers do..
Let me note first that I'm just as disappointed that they moved production of the unit to China as you are. I don't own any modern vacuums I'll cling to my vintage Eurekas, Hoovers and Electroluxes.
I worked at a Riccar and Miele dealer and for a while we had both the R25 and Vibrance series side by side on the floor until the last of the Vibrances sold and that took quite some time. I had my own skepticism of these new machines and even noted that to the potential buyers and still three to one they bought the new R25 models over the older style machines. They might not have quite the same performance however it is more than adequate for most people. What sells the customers is that it is a modern two motor design with simple switch to turn the brushroll off, not some complicated clutch arrangement that hasn't always been so reliable, lifetime belt, too. The tools and wand are especially easy to pull out and use, especially compared to the older VIBDL.2 model, and all wheels are non-marring rubber. The bags are also far more consumer friendly to change
What Tacony did with these units is to look at what Shark did right to get such a marketshare, all these features are something that Shark was the first to bring to the mid-price field. Like it or not, these vacuums have features customers want.
One more note, they frankly haven't had any more issues than the older models, they are far more reliable than the Tandem Air machines. Will they last forever? No, but they will outlast most anything else at that price-point and they have full parts support too.