The downside of using the level parameter is that it affects the reverb tails when switching to a channel that has a lower level. The input gain parameter doesn't have this behavior because it's like a bus send so it allows the tails to ring out naturally, which is why I have been using it for years instead of the level parameter on parallel reverbs and delays.
But on 6.00 the wet level is so much lower on Nimbostratus that several of my parallel reverb settings need to have the input gain maxed at 100%, and the wet increased further with the level parameter. But because of this the reverb tails are affected when I switch to a channel with a lower level, whereas before with the 5.01 wet/dry mix I could seamlessly switch between reverb channels because they were all at level 0, with just different settings on the input gain. This is going to severely impact my live workflow. I love this product and can understand changing the sound of amps or drives in pursuit of greater accuracy, but I do not understand this decision.