Good for what? A clock radio or Bluetooth speaker maybe, but not valuable hi-fi gear.
Cheap parts are OK in certain places, but not in good hi-fi gear. I’d suggest that a technician advising you that cheap Chinese parts are perfectly good is probably not someone you want to use.
“But Mike, Musical Fidelity uses cheap Chinese parts!”
Yes, they do, as do many manufacturers including Cambridge Audio, NAD and Redgum…
The single most important reason a manufacturer would use Chinese parts is to save money. That’s it, there is no other reason. You might want to extrapolate from there and decide what that means to you in terms of a bigger picture view, but there is no good reason to fill a board with the cheapest parts, other than because the person or entity doing that is being cheap.