Have owned two 4Bs, 7Bs, 7BSSTs and now 7BSSTs squared amps, all with a Bryston preamp (and for a while, a Z Systems digital equalizer). Over all these years, never clipped once. The reason, I think, is simple: I don't run them at wall shaking volumes. It might be fun to do this, but it is hazardous to one's hearing, risks clipping, and might damage the amps and speakers. After all, there is a reason Bryston designed its amps to show you when clipping is happening. As to heating, for the same reason, my 7Bs have never inched up to more than very slightly warm to the touch, and my 4Bs to only slightly warmer - never hot.
The bottom line is that running at ear-shattering levels is like driving a car at very high speeds - it's nice to see what your baby can do, but it's risky and in some situations, just foolish - something of which I confess I have been guilty, and have regretted.J
Dave