often times yes, but for stems I don't think so.

A Kalloy Uno 7 stem on ebay only costs $25 and is lighter than any other stem ive seen. They are 4 bolt, well finished, light, and inexpensive. Keith Bontrager can pout about it.
The graphics are annoying, but 15 seconds of rubbing with nail polish remover leaves the stem simple and black.

I have Uno 7 stems on road bikes and my gravel bike- can't imagine paying more for a heavier stem unless its because I suddenly have to match the cockpit...but thankfully I've never felt compelled to do that.