I will eat my own hat if someone can prove a performance reason that shocks would be 'upside down' , at least in off road.
The only reason I can read is one of shock absorber design which requires the shocks remain right way up / upside down, which ever way you want to look at it - but with the piston at the top.
Any time you read about upside down (same way we ALL use them) it is about performance, not restrictions.
Anyone got any salt then? my hat looks a bit flavourless!