I certainly sympathasize but the key word in this statement is "advertised". In other words, that is marketing "hype". There just is no such thing as a good gaming laptop (or desktop replacement). And if given a little thought, one can realize this makes total sense.
Consider this. Laptop manufacturers can pack the horsepower of a PC into one of those tiny, extremely thin laptop cases, but the not cooling required of gaming rigs. Gaming is just about the most demanding task we can ask of any computer. Even quality mid and full-size tower cases, with their massive case fan capabilities and support for HUGE CPU cooling solutions, are challenged to keep the innards properly cooled. Laptops are really designed for road warriors, students and others who who require mobile computers to create Word documents and give Power Point presentations. They are compact devices that, due to the Laws of Physics and thermodynamics, are simply incapable of providing the necessary cooling needed for a gaming machine.
It certainly is PR and brainwash, but it is way beyond, and existed centuries before the "ROG" culture. It is the culture and engrained mindset of every marketing weenie who ever existed. And sadly, it is perfectly legal - when worded carefully. In business law it is called '
marketing "fluff".'
***
@EsliteMoby - You don't mention your CPU temps, how are they? Does your system throttle back it hits these temps? You asked,
If anyone could accurately predict that, they would quickly become zillionaires.
"IF" those temps are still "
comfortably" within the manufacture's specs for the "normal" operating temperature range, the VRAM should not fail prematurely (or before the warranty runs out!

). But if those temps routinely sit near or above the published specs, you should expect they will fail prematurely as those temps will increase aging.
Are the vents, accessible cavities and bays clean of heat trapping dust? If comfortable opening the case a little more, is the interior clean of heat trapping dust? Beyond that, I agree with eidairaman1 and consider getting a decent cooling pad. I recommend the use of a cooling pad with its own external power supply so you don’t put more strain on the laptop, causing it to generate even more heat. But sadly, pads with external power supplies are getting harder to find. So if the pad runs off USB power only, I recommend using a
USB Wall Adapter to power the pad whenever possible.
When home, you could try blasting a desk fan across it.
Other than that, my best advice again echos that of eidairaman1 and I recommend a quality PC when at home for your gaming and just use the laptop for less demanding tasks while you are mobile.