This is basically a marketing experiment.
If they see strong demand for the AM4 platforms they might choose to make a lower cost Zen 3+ DDR4 platform to complement Zen 4 and basically fight Intel on budget offering.
There might be enough 6nm laptop chips available to make a limited run desktop line with the leakier bins and use the node optimizations to put more X3D chips on AM4.
Personally I'd probably go for a 5950 X3D if it was price competitive with a 13700k setup.
If they see strong demand for the AM4 platforms they might choose to make a lower cost Zen 3+ DDR4 platform to complement Zen 4 and basically fight Intel on budget offering.
There might be enough 6nm laptop chips available to make a limited run desktop line with the leakier bins and use the node optimizations to put more X3D chips on AM4.
Personally I'd probably go for a 5950 X3D if it was price competitive with a 13700k setup.