I think they don't put grass strip because it can provoke drivers to loose control of their car. But these sausage kerbs aren't meant to be rolled at this speed.The especially annoying thing about this is that those curbs are there to solve the problem of drivers using that as part of the racing surface, which only came about because they pave every square meter of surface at modern tracks. I understand paved runoff is safer, but the implementation is asinine. They've just created a whole host of new problems by the way they've done it.
Like was suggested earlier, there should be a grass strip separating the runoff from the racing surface. It allows for a paved runoff for safety, prevents drivers from abusing that surface automatically, and completely removes the "need" for these stupid sausage curbs that are quite clearly dangerous. Remember that crash at Spa coming up Raidillon last year (was it F3 as well?)?
I'm still pissed off that they didn't do that in turn 2 at Mosport when they paved that runoff zone; completely neutered the corner and everyone takes advantage of it. Every start/restart is a farce now. They left a grass strip in turn 8, so why not in turn 2 as well?
Like you said, FIA created problems that didn't existed 20 years ago and laxness has never proven to be anything good, specially with safety. The recent accidents recalls it dramaticaly...
Perhaps they'll create a system slowing down automaticaly a car(or bike) whose wheels are off track limits.