My personal thought on the matter of "many bamboo rod fishers and collectors" and Zhus are simple: These guys don't want to let go, and are angry that something cheap is on the market which removes some of the cachet of their antique, or newly made, rods.
Certainly from the collectability standpoint, there's no worries. Guys who've spent big bucks assembling a collection of prestige rods have nothing to worry about, but given the choice between a 70yo old mass-made (as best that label applies) by someone with an American mailing address and fished hard versus a brandy new mass-made by someone with a Chinese address for same, or less. Well? No wonder modern makers are sweating these things.
I'm sure the same thoughts were heard when things like fiberglass first came on the market, or people first started to offshore production. I can easily remember when I started reading about Chinese vs Korean vs American made, and that was only 3-4 years ago!
I also wonder how many of the modern, low cost, makers are just using Zhus blanks for their rods, anyways. I'm not clued into this field at all, but how many pre-made bamboo blanks can one find out there?
Sometimes, an extra $100-200 is more than a person can swallow. If you can afford a $380 rod, but you can't afford a $580 rod, then so be it. You buy what you can, and you enjoy it. One man's trash is another man's treasure.