This would be good advice for people getting ready to build a new a new system. But I would want to hold manufacturers (PSU / GPU / CPU / whatever) to a higher standard. Ideally if the GPU says you need 500W ATX PSU, you should be able to just get any 500W ATX PSU and it should work reliably. This is not how it is, and it may never be like that, but I think we should always aim for standards and interface specifications that can be depended on.You let other people be guinea pigs and buy hardware combinations confirmed to be working by other people on the internet. It's not hard. That's some of the best advice anyone would ever get with building pcs on the internet, yet none of these streamer/vod scumbags will ever just say it.
Apprently ATX 3.0 allows spikes of 3x power for 100 us.
Despite this, I feel like this is better fixed on the GPU. If the GPU needs 3x power draw for 100us it should be up to the GPU to put more capacitors on their board. Small high power transient spikes are usually better served by bringing capacitors as close to the destination of the power as possible.