Especially the engineers. They will think twice about building unreliable or unintuitive systems if they then have to support actual customers using them.

YES!

Far too many companies treat tech support as a necessary evil trash cost center, instead of the absolute goldmine that it can be.

Tech support is a highly concentrated vein of real-time descriptions of things that can, and in many cases must be improved for your product to thrive. Don't ignore it — actively mine it!

I hate when I don't see the end user feedback as an engineer.

When I see users forced to waste time with elaborate workarounds and hacks to use software I made I feel real guilt even if I had no way to know it wasn't well suited to their needs.

And UI designers. And product managers.

Especially professional services folks - if you don't know how it breaks (and likely fixes), you have almost ZERO reason to be in the field