Modern bikes somehow allowing a rider to break their limits "faster" than say a bike of 10 years ago, is really a just a matter of seconds. It's a nominal thing, IMO.
If anything, I think modern bikes serve more to allow unaccomplished riders to seemingly extend their limits. Often times to their detriment. Things like: ABS, linked-brake systems, traction control, back torque limiting clutches, etc, etc....
It's a bit of a double-edge sword, because that which can be a great aid to an experienced rider, can in turn provide a potentially false (or at least exaggerated) sense of competency, that can come back to eventually harm the rider, if they don't keep their true riding abilities in context. I hesitate to call them safer developments by default, because if misused/misunderstood, they can create a less demanding rider as a by-product. Flipside: If given to an already demanding rider, they can provide a true safety element.
I believe the word of the day (for this thread at least), is complacency.