The muscles you use in climbing are different.
Hence, if you have not been training those muscles, they do not have the mitochondria and capillary blood vessels increases, as well as the improvement in muscle recruitment. It would seem reasonable that it would be harder to produce power numbers.
For the reasons I just stated, and therefore to make the comparisons with previous HMs that were not done with increased gradient, I locked the Kickr to stop the gradient change.
In general, the climb feature is an important feature if you like to do climbing. For example, G.O.A.T. done with gradients is a completely different experience than without – much harder.