I think this is true. There's no doubt it's scratch resistant, but also no doubt the it is brittle when compared to steel - this is not the slightest bit controversial.
Do they shatter? Yes, absolutely, and since you mention Panerai:
But other brands do as well, so here's an IWC:
And of course Omega:
But completely shattering is only one mode of failure, more common is chipping:
For impacts, it's as much where and how it's hit, rather than exactly how hard. An impact in the wrong spot can cause damage that would not cause damage in another spot:
If I recall correctly, this watch was dropped onto the rim of a water glass from just a short height:
How often does it happen? Only the brands know, and I'm sure they aren't going to tell anyone. I think this type of failure was "big news" when these watches were first on the market, but I see fewer reports now, and I think that's because those who own them have simply accepted the risk, or mitigated it with insurance. No one should be surprised if they hit or drop it and it breaks, but it's up to the individuals to determine if they want to take that risk, provided they even like the case material to begin with.
Your making this whole materials issue the fault of others is quite nonsensical. Many people prefer stainless, and you prefer something different. Making this into a "new technology" v "old technology" argument is equally as nonsensical as blaming others for the choices a brand makes. You have stated your issue is with GS, so why not ask GS why they didn't make any Ti watches in their latest run, rather than go on multiple forums and blame others for their own preferences?