You can make a few 'assumptions'...dangerous, I know.
First, While even Bryston (just an example) is built to a price point, they spend time voicing and have a higher parts budget, not to mention higher labor costs. Part which effect voicing are chosen by sound, not primarily the price.
Hi MTBF or MilSpec parts are chosen for some locations. Transistors may be more closely matched for gain and threshold. All non-power resistors will be premium 1% film. Binding posts may be WBT or equiv. Caps likewise. At least Solen or Clarity SA level...or better
Bryston uses (or darn well better) hi-end glass epoxy boards with premium plating. I've done some board level repair and working on that type of board is much preferred to one that is made of some mystery material.
Bryston does a full burn-in and offers a 20 year warranty. When you buy Bryston, you are buying down that warranty, in advance.
Worth the extra money? Only you the buyer can decide. Some persons also believe in supporting 'the home team' which would include US or Canadian products. I already know nothing is 'pure' anything, but would like the labor to stay here.
I don't think Emotiva is a mistake. Good value. but I keep equipment for long time periods. I have had some stuff for 20 years. That's all gone now, but what I currently own will be with me for a while. I don't get the upgrade bug all that often.
The last amp I had which needed a fix, had been taken out by a power company ZAP, which they paid for.