Yes - off SG since last spring.
So latency on SG - this should never be an issue in INPUT mode right?
As far as latency through SG and PT this should be more about the buffer size than anything else. I used to measure at 96kHz something like
StudioRack in INPUT mode = 1.2ms
SR not in InputMode monitor through PT 96k/64buffer = 4.1ms
So regardless of the delay comp value - when monitoring I never saw any of that show up in RTL (and it was like 3 or 4 thousand samples).
Assuming one has an HD license -
HDX card used close to $2K.
Hard to see that as a barrier
But HDX has its own pluses and minuses as this month I have to donate $400 for keeping my HD plan up to date!