Yes the older platform can indeed struggle with even 3200MHz, we have seen the same here, that normally the cheaper 3200 kits in most X470 or 450 mainboards you have to run at 3000MHz for stability, we have found using our 8 Pack 3200 kits will run at 3200MHz and at like 14-14-14-28-1T, but of course a screened Samsung B-Die kit is like £140 versus say £60-£70 for a 3000MHz 16G kit.
The X570 is much improved in this aspect that now 3200-3600MHz is pretty damn easy and pretty much across all mainboards, but we have being testing with B-Die in fairness but we are seeing far less problems, 8 Pack is gonna do some testing with regular 3200-3600 kits in X570 as it should be much improved, my point was basically more to advice customers to not shell out for the super-expensive 4000MHz plus kits, simply because the sweet spot is 3200-3600MHz with better latency's.