I will not be adding any more republics to my game, the default ones plus Aden and Iceland are enough for me. Aden I added mostly as a lark, and Iceland actually makes sense since there was no trade there from the Hansa. I've actually modded the Hansa events in my game so the Hansa CANNOT form if Gotland still exists.Frankly, I'm a little sad that they didn't just bother to put in some of these in vanilla to begin with - they could have just focused on the five big ones, sure, but there's plenty possible, and it's a good thing that PB will add some of this (and my silly little VIET mod too, and almost certainly many other mods as well)
Adding too many republics takes away the uniqueness of their gameplay for me. I want to see major trading empires like the merchant leagues actually had, and not a splintered map of random seazones held by a republic here and there, which is what adding too many will lead to. At least Aden and Iceland are in historically empty areas.
But to each his own.
As for not playing - I play on a my laptop (starte with a 1.07 save updated manually to 1.09 now with a lot of stuff back-modded in and of course using MyMod), my desktop I use mainly to mod and run quick test games.