Disagree that it’s a line in the sand. It’s use the right tool for the job.
If a device is low FIB, it’s that way for a reason. There are plenty of ways to massage that with policy and software, depending on capabilities , but at the end of the day, trying to sort 10 pounds of shit to store in a 5 pound bag is eventually going to end up the same way.
Some of the reasoning behind 'i need/want to do SDN things' is 'low fib device' sort of reasonings. Some is: "I just want a forwarding decision that's not entirely LPM oriented"
(or to be fair: "My LPM is not JUST longest prefix, but also some other data")
which still seems to be actively developed.