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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...
To be honest there are workarounds for this that make it less than critical as a missing feature.
Simple one would be to run a ddns client on the machine you are wishing to connect to from outside you network. You could also fire up a cheap raspberrypi running pihole and a ddns client on your LAN for a low powered solution to the problem.
In the stationary use case there are simply other options than having this baked into the modem/router.