Keep making baseless assumptions about somebody you've never met, pal. It's not a good look. I think you're projecting.The size and weight of the 4090 is just ridiculous.
My current and previous cards were 1 kg / 2.2 lbs. (The motherboard's horizontal anyway.)
This thing weighs 2.2 kg, almost 5 lbs. That's nearly a kilo heavier than my laptop!
Spoken like somebody who has spent too much time in an echo chamber with other people who have put PCs together over and over. If assembling a PC were so easy, half the posts in this forum probably wouldn't exist.
I searched youtube installing 4090 and went through the results on the front page. One couldn't use the anti-sag bracket, said he'd have to drill it later and used a clamp thing he had lying around. "It's not perfect but it looks like the best we're going to get." GPU hit his case side panel so he had to push it. The next had to trim a header cable with a knife to get the anti-sag bracket to fit. Another used blocks of styrofoam for anti sag. Another didn't use anything at all or even mention it. Another installed a ROG support but without explanation and to me it looked loose. Another attached the anti-sag bracket to the motherboard but didn't show attaching the GPU to the bracket. The rest of the links were either about PSU connections, drivers or vertical brackets.
I know what's right and wrong with these videos because I know what I'm doing. Users who haven't even seen let alone touched so much as a motherboard before have no chance.
The idea that it would be okay for somebody can order a PC for thousands and be told they have to install the most expensive part themselves with full liability because the supplier dare not, and go find some YouTube to tell you how...yeah right. It's not the end users who are lazy, it's the manufacturers and suppliers.
Now jog on.