This post from late 2017 suggests that hardware flow offload will be available for other hardware besides mt7621. Is it available today in late 2020? If not, where can I find the latest news about its development?
I did some more research and was able to find proprietary drivers includes in recent releases of other router firmwares. FreshTomato and Asuswrt-Merlin are two examples. Are all of those drivers incompatible with the newer kernels? Could the same drivers be included in OpenWrt in the future if they are compatible?