I don't buy your "safety" argument. In this case, logic would suggest that if the wood feeding through the misaligned blade is producing severe pressure against the fence that you would PREFER that the fence moves. The alternative is that the blade bends, binds and BANG!
There really shouldn't be enough sideways force against the fence to deflect it unless you are supplying it. It is under your control. I think that one is more likely to forget to lock the fence tightly than they are to feed wood with enough sideways force to skew the typical bies style fence.
In general simpler is better.
That said, I once built a table and a fence for a bench type saw. The fence was a t-square type, but because it was made out of aluminum angle stock and was 4 feet long it REQUIRED that the tail end be clamped down. Not to get good alignment, but to make sure it was not going to move around. It was rather whippy. This points out that each type has it's merits.