My technician told me cheap Chinese parts are perfectly good, what are your thoughts?

My immediate thought is that any technician advising you that cheap parts are perfectly good is not someone you want to use!

Look, some cheap parts are OK in certain places. As a general concept though, this comment indicates a lack of understanding and appreciation of the differences between parts.

“But Mike, Musical Fidelity use cheap Chinese parts!”

Yes, they do, and so do many manufacturers including Cambridge Audio, NAD and Redgum