Have you EVER heard of it being a problem with ANY gun that incorporates this feature? From the P-210 through the CZ and Tanfoglio/EAA guns to the cheaper Stars?
Seems to me to you're trying to see a problem where one doesn't exist.
I don't think your concern is realistic -- unless, of course, you think you're going to have to fire 500 rounds in self defense, sometime. And if that's the case you'd better have a pretty big backpack for all those 50 or so mags, 'cause otherwise the gun's going to cool down as your reload 5 or 10 mags.
I no longer have a CZ-97B -- mine was just a bit too large for my hand -- but I never had a problem with the slide-inside-the-frame design on it, or any other gun with that feature. It certainly wasn't a problem with my 5 other CZs or my P-210-6. Or my Star Firestar Plus.
Slide-inside-the-frame is a characteristic of EVERY CZ,every EAA Witness, and Tanfoglio gun being used today. And this includes the IPSC Race Guns used in international competition. I've never heard of it being a problem in IPSC, either -- and they shoot fast and long, there. Those guns GET hot.
The firing pin restrained by a roll pin is a feature I don't like either, and they have been known to break during dry-firing. But you can use snap caps, or get one of the new "doubled" roll pins that don't break. (Or get a modified firing pin that won't strike the roll pin.)
I dry-fired my 97B a lot, but never had a problem. I dry-fired a 75B thousands of times without a problem. I dry-fired a 40B a few hundred times and broke the pin. I replaced it with a $.30 part from the hardware store, cut to length with a Dremel. I also got the firing pin modified. Did the same with my 97B.
All 97Bs have the same beavertail, by the way. The only changed feature that I'm aware of are cocking striations on the front of the slide with newer models.
If you're looking for an excuse NOT to get a CZ-97B, I think you're going to have to find something else -- like the big grip or the long double-action trigger pull. Or not wanting to use the "thumb on safety" technique in the 1911 style when starting from "cocked and locked" (SA mode), which is an option.
Otherise, you're passing up a very good gun.