Is this one of the side effects of the AMDs great for gaming but not so much for audio i also find to get an ok MB is kind of pricey and the max ram is not always clear on some MB and CPUs
Even the cheapest Zen 2 desktop chip supports 128GB of RAM.This is generally the AMD set up i find that there pricey MB quote max ram size but the cheaper boards are not so clear so you may get stuck with a 32gib max, also the zen is not very clear with max ram size until you go for the very high speed Zens or high speed thread rippers
Some smaller form factor motherboards will support only 2 sticks of RAM and that will limit you to 64GB maximum; this is the same for Intel and AMD platforms.
The newest AMD X570 chipset boards are more expensive and mainly because they support PCIe 4.0 and the added complexity of that can’t be ignored. So in that sense they are more like a cross between a desktop and HEDT board and the latter aren’t cheap either, starting at a much higher price.
There is no need for an X570 board to use the Zen 2 chips as the older and cheaper boards will support them but without PCIe 4.0 support. You’d be stuck on PCIe 3.0 alongside Intel’s whole range.