I think it would be better to give you a few different values to switch between. The 2203 isn’t really a plexi with a bright cap. Brit Trem is closer to that than the 2203. People that love the 2203 model are people that love a 2203.
Compare Brit trem to the helix plexi model. The plexi model has a bright cap, just a really low value one compared to the stock one (Brit trem). There is a certain charm to the stock value for certain sounds, but people removed or lowered them commonly for good reason. Brit trem will give you a good feel for that. On the positive side, if you run the plexi pretty hot and don’t use much other than light boosts in front it does that sound in a really cool way. Try to run it a little cleaner or with many drives and stuff in front of it, and you’ll quickly wish you had a way to ditch that cap.
Knowing the difference, if I had to pick between the stock plexi cap and no bright cap, I’d probably take no bright cap. The amp is just a lot more versatile that way and I can always put a boost in front that gets it close to that bright, shelved thing for the times where I want that.
I hope they add an option for multiple values for it in the future, it doesn’t need to be almost anything you want like fractal. Something like off, low, bright 1, and bright 2 would cover the useful range for most vintage style amps. You could drop that down to 3 options even and be fine.
D