That looks like a pretty extreme angle to me. I guess if you mic it up through a PA for a gig it wouldn't matter.
My DIY amp stand angle is a bit of a compromise between my ears and an audience's ears. Folds flat for easy packing and works with all my amps too. Still going strong since 2000.
Making the world a better place; one guitar at a time...
I was thinking the same thing myself before I did this mod..the amp is quite a bit bigger.
In practice though it seems O.K. in the house.
I can always fabricate a slightly longer one if need be.