I agree with you.
I was just suggesting that an SDR with no further updates does resemble a hardware defined radio in one aspect: that it will remain in that exact configuration for the remainder of its post-update life. Yes the SDR remains software defined, but it no longer really matters if no more software becomes available at the end of support time (which was the original OP topic).
Sometimes third-party aftermarket updates do become available for SDR software, just as hardware mods were/are available for "HDR"s.
73, Ed