Well he is not gaining anything and has a downside. If you bridge two amps you are assuming the amps are absolutely identical, in every way including output level. Any variation of performance with aging components, will cause the waveform to be asymmetric. I think bridging is generally a bad idea, and very much misunderstood. The OP with his set up has no benefit whatever to derive, and potential downsides.
Peter Walker of Quad was not a fan either. He would supply bridged amps to special order, but he would hand match all output devices and the amps were precisely level matched, and he added an internal adjustment to do just that.
You are much better off getting an amp of the power you need rather than bridging, which is fundamentally a fairly bad idea.