Depends on what you consider temperatures not being an issue lets say someone doesn't have that seasonic. I have a corsair hx 1200i , as another poster mentioned without software the fan will not spin. Even my initial setup with the power supply (2700 non x / 1660TI ) it was getting as hot or hotter than the 1660 Ti... I mod cases each time i build a new system in a new case anyway which I tend to keep PSU's and cases the longest of all components. Anyway I finally moved the powersupply out of my system as I refuse to use corsairs software which bugs out various OSD's and certain games I play.Remember that laptop PSUs are enclosed, whereas desktop PSUs are much, much larger, and have venting, allowing for natural convection cooling, as heat rises.
Seasonic has a 700W fanless unit, that performs amongst the best ever tested in review, and temperatures aren't an issue.
Avg temp on 1660 TI dropped by 8c (thats alot in Fahrenheit) While the increase in temps of the PSU may not harm the PSU or "be an issue" FOR the psu....that heat isn't magically transfered ..it bleeds into the surrounding components. When i was messing with the 5700 and 5700xt I woulda hated to see the temps on those two cards as they ran much hotter for not much hotter. The 3600x and now 3800xt (soon likely 5800x + 6800xt) no doubt would suffer from the psu just sweating heat out into the case.
A simple toggle like the backup bios 3d cards have now and mobo's have had since well my gigabyte board in 2002 had a bios switch... For the fan on these psu's would be prefered vs forcing software usage or acceptance of heat hampering other components in the system.
I have had 3 diff ram kids across the 3 processors (all same motherboard) and I can tell u tho ram isn't that sensitive to heat ... it doesn't help and the initial hynix kit i had went from locked at slightly better than its 3200 c16 xmp profile to right before replacing it 3600 c14 on that 2700 and a short period on the 3600x. after PSU being removed from the equation.
So temps not being an issue is subjective