You're implying that the banjo sustain would be different if played on JTV '59 as compared to a '69 because of the build of the guitar? They sound the same on both. As does the Spank. Single coil pickups have nothing to do with it.
I never said that. One time they implied that an LP has more sustain than a Strat, which might be why people are hearing less sustain.
Since the 69 is a strat model, and if strats really do have less sustain, that means the modeling of less sustain, plus real less sustain of a 69 = really low sustain. It's a bad idea to emulate decay levels of electric guitars. No one wants that. People want the longest sustain.
The reason why the Banjo calls for it, is because the sustain is generally extremely short on a banjo compared to a guitar, so it calls for it, or else it wouldn't sound like a Banjo.
Guitar sustain has a lot of variables, and we shouldn't assume all strats will have bad sustain and emulate that.
Like we said, if they DID put a decay system in the strat and other electrics, they should allow you to disable it in workbench.