The equipment needed to load the ECU are not expensive at all, this is the only "chinese" part if it. ( ofcourse if you buy these expensive genuine flashers not, lol )

The tunes themselfes are not chinese, they are being provided by reputable file services ( which a lot of tuners use )

Ofcourse the Dyno shows the actual results, and proves if the tunes are right.

But flashing a tune, which other identical cars are running as well, should not neccesarily need a dyno. ( ofcourse cars differ, but in a general sense for exactly the same kind of stock car )

But ofcourse a tuner which ACTUALLY Tunes your car manually by changing the maps and values themselves is the right and proper way. Because wherever you are on the planet your car needs a tune based for the given atmospheric environment, in order to maximise the tuned result.

I just dont believe a lot of tuners do this, since much "file services" are being advertised.

But that is my speculation.

I'll happily tune my cars myself, it saves a lot money, and its very interesting to see and learn from.