I'm not wrong, your experience is just different. I have asked Keysight and Tektronix for support in the past and didn't need to have warranty or a limited number of tickets. I got my technical questions answered to a satisfactory level. It is simple as that. But I did make sure to be really clear, without adding any excess information, in describing the exact problem and what my exact question was.
I've asked Keysight for a repair of a U8001 power supply. ~1000 EUR. As a company.
"We don't repair that, but we can provide you with a quote for a new one"
"Ok can you send me a service guide?"
"no, doesn't exist, do you want to buy a new power supply"
"I will, but somewhere else.

" Ended up repairing it because all it was a blown SCR.