I don't really know how you put together your preset, but what you are stating is not correct. I definitely don't need that many delays (stereo or mono) in a preset, but I just put together a preset on my Quad Cortex that easily runs 6 stereo delays. Yes, that is 2 less than the Kemper can do, I'll give you that, but claiming it is running out of steem after two is simply wrong.
I discovered this problem on the first day and after searching to find out if anyone else was having the same problem I found these videos that illustrate it. I agree it's not a problem in most cases, but it runs out of power suprisingly quickly when you try and run multi-amp rigs. They'll fix it I'm sure, and there will be workarounds, but at present there is definately a problem here, a problem Neural acknowledge and are working on.