For reference a high grade titanium bolt is between a grade 5 and grade 8 steel bolt for strength. (Probably around grade 6)
I tend to go stainless for anything with higher stress. (304 ss is around grade 9)
I've seen ti bolts break.... not on a yeti but just in general.
Fwiw
I stand by my previous post; as you make no mention of The special McMaster-Carr 304 Hi-Test 304 SS bolts you posted later on.
That is my beef with this post; the average Joe does not know that the cheaper hardware store 304 bolts are far inferior to the Grade 8 steel bolts that they are replacing. Via your recommendation (as your description is incomplete). So essentially you are responsible (IMO) for those that follow your recommendation and have issues.