Foxholer
Blackballed
It is logical but not for the reason that may be assumed. The intention is to create a progressive bias in favour of the lower handicap player to balance the greater tendency of higher handicaps to get net birdies and pars in 4 ball.
So mathematically, +3 is clearly not 3/4 of +4, but that is not the intention.
But it was intended for 4 ball matches, and 3/4 was the suggested correction factor. 1/2 handicap in singles sounds extreme and an overbalance.
It's totally equivalent though. And for something like an eclectic (often half handicap) it's appropriate! That Decision does not specify Pairs comps. 4 Ball Matches (4BBB) are calculated differently - as 3/4 of the difference from the lowest player, so it doesn't matter whether the lowest playr is a Plus-capper or not!
And how is +3 not 3/4 of +4!