Why is Two Transistor forward snubber so villified?

[cupoftea]

Hi,
Why is it that the attached output diode snubber (.PNG and LTspice) for the two transistor forward is so villified?
Its just a basic RCD clamp style snubber, and even recycles some of the snubber energy back
to the output.

 

[aliarifat794]

The RCD snubber dissipates the energy stored in the leakage inductance as heat through the resistor. This is often seen as inefficient.

 

[Easy peasy]

Aah - the harsh realities of the classic fwd converter, turn on the fets too fast and you slap high dv/dt onto D1, then at fet turn off, D2 suffers.

 

[D.A.(Tony)Stewart]

Input vs Output power looks harsh.