Most of the analog board caps are of the larger size variety, and as a result, most of the time you can get away with good system operating without swapping them out. My SE/30 has new logic board caps but I never spent the time to replace the analog board caps. A lot of the bit analog board caps are very big and over-spec'd which is why your system still works even though the capacity has diminished through the years.

If you want to be thorough and have the best electrical functionality possible, then yes, by all means, replace all the caps on the analog board too. But once you start on a job like that, then the next logical step is to also swap out the electrolytic tanks in the PSU (power supply) too. And for an SE/30 power supply, that would be a real time consumer!