I've never said your garment are of low quality, I have no experience of them to make any such judgement.

My observations are based on many years working with clothes in a professional capacity, as both a tailor and cutter.
My tutors showed many examples of all sorts of interfacings and linings fusible or plain, woven or not, and what would be expected after years of use.
They were always of the firm opinon that bespoke clothes deserved the best , both in fabric which could be seen and that which couldn't be.

You've had good experience of using fusible products, that's great, but it's not everyones experience.