IMHO the differences between IPSC and USPSA is a lot smaller than what most believe.
IPSC shoot non "humanoid" targets.
Out Production gun or PD only allows us minor changes to the gun and only 15 rounds per mag at the beep. Your "Barney" mag may have 16 at LAMR.
Indeed sandals and "hat cams" are frowned upon, but only from a safety angle. As RO I am NOT going to allow a guy to run dowm my clubs Bush lane in a pair of "slip-slops".
In SA, as a PC thing, we may not wear cammos on the range.
Some countries got exemption from some of the rules because of local legislation. At the end the differenses as pretty small and the similarities big.
The "anti`s" are good in creating an us and them mentality in our sport. They have always used the divide and conquer thing on us and, up to now, it just keeps on working. Shooters are a lot like South Africans, if you have five in a room you will have 3 political parties. We all like to do our "own thing" and to hell with the rest. Meanwhile the anti`s are duping stupid politicians onto taking away more and more guns. I am just worried that one day we wake up to find that only criminls may own guns, worldwide.