Honestly, I quite like that warning. It's not the agree/disagree version that warns you that your warranties may be invalidated. I'm glad they didn't threaten the warranty in it, as that's not appropriate when XMP/DOCP/EXPO is pretty much universally pushed by both the CPU and board vendors and should be reasonably safe. I don't see anything that's not really just stating objective facts in it.
I'm in favour of people being aware that beyond-JEDEC RAM speeds are a type of overclocking, and I think there's a significant portion of the community that either don't know that or tend to forget it. New builders come along and see XMP/EXPO being promoted, see the memory vendors promising speeds around double the speeds offered by the manufacturers of the DRAM silicon, and quite often have a bit of a collision with reality when their newly built system fails to POST. The stability and compatibility not being guaranteed is really just what it is, particularly with DDR5 at the moment. ASUS are stuck in the middle between the memory vendors pushing their binning as hard as they think they can, and the silicon lottery aspect of the CPU memory controller. Some people are going to end up with DIMMs that were on the low end of their bin, configured with a possibly overly aggressive XMP/EXPO profile by the memory vendor, and a CPU with a weaker memory controller; they can't absolutely guarantee compatibility when around two thirds of the contributing factors are beyond their control.
As a community and industry, I think we need to have these informative notices, and more of them. Make people aware when they are possibly pushing a limit or two, help them understand it. We see countless threads of people buying ultra-fast RAM because of the promised performance, but then running into problems because they didn't properly know the finer points of RAM compatibility. Somehow, we need to improve awareness of the QVLs, the fact that 4 DIMMs and ultra-speed just don't mix well, the fact that higher capacity DIMMs (e.g. 32GB) tend to have more of a problem with higher speeds than smaller DIMMs, etc.
Could the wording of that notice be improved? Possibly. I'm not saying it's perfect, only that I don't have a big problem with that notice as-is, and that I think that spreading awareness around memory overclocking is actually a good thing.
