Yes I could wait, but for the moment Steinberg does not consider that there any input gain problem with the UR22 when some guitars are plugged with with Hi-Z enabled. My guitar is a gibson LP Junior with a P90 mic that is not a mic supposed to have a high output, so I can imagine with guitars like Jackson with active mic.
There’s no problem my a bass or acoustic guitar.
This is what is written in the UR22 description : “the Hi-Z switch on input 2 allows for direct recording of electric guitar or bass without the need to use an additional DI box.”
In a certain way, this is not really true. 
If you say me that there the same issue with the 824 Hi-Z gain (I haven’t tried with mine yet), I hope that Steinberg will consider this issue and find a way to fix it.