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By not providing dynamic DNS support, which is a standard feature for ALL other routers/brands these days, you are greatly reducing your target audience and market share this device will appeal to. I...
It is not an argument at all. I genuinely don't understand what you are looking for in DDNS whilst at the same time accepting you are sitting behind CG-NAT.
You either expose the 10.x.x.x address you are assigned to have which we know isn't usable. Or the CG-NAT address which you can't route via anyways. In order to solve this for my own setup, I could either pay more for a routable ISP-provided address (now not offered unless I convert to a business account) OR set up an external IP and a VPN. I took the latter option with a wireguard setup and an Amazon lightsail instance using algo, I can now publish services via this VPN tunnel. There simply was no other way around it.
Whatever Netgear do for DDNS won't solve a CG-NAT issue UNLESS they also provided a MITM type service to route you back in that runs on the M1/2 and their external infra. The way chrome remote access and others get around CG-NAT.