do you need more than 64GB RAM of RAM? Then get 128GB. If not, then don't.
Adding RAM for no reason doesn't improve performance, and Intel already cares very little about RAM speed/latency outside a very few specific workloads.
Is 4000Mhz significantly better than 3600Mhz? If not, I'd rather get the 128GB kit since having more RAM is better for me since I do quite a bit of content creation. My current rig has 64GB and it's fine so I can manage with 64GB but I'd prefer to have more RAM for those occasional use-cases where it may be needed.
I don't have the board but even I had issues I referanced to have to tweak timings on b-die
I used to just set the rated speed and timings/ voltage and boom everything worked
No more after 1705 bios so yeah asus messed something up or Intel micro code is.