… and it is shrinking into oblivion because of less and less support from AMD, Nvidia, Microsoft and game devs alike.
The only thing I can think of where more PCIe would be interesting is storage. But then again, we have no way of fully utilizing today’s fastest NVME drives because even USB3.1 gen2 isn’t remotely fast enough and thunderbolt is Intel / Apple developed and will probably die like firewire in a couple years. The special connector for it is already gone.
Also price is important, Ryzen is a consumer part. If you absolutely need tons of PCIe there are other options, like @mihawk90 said.