milliepops
Wears headscarf aggressively
Tbh I was wondering about some little hind studs for showing on grass
is that a thing? Lots of slippy slidey rides going on at my local county show last year 
I used to stud for everything behind and added fronts for dressage and kept them in if there was either no cut in the ground at all, or if it was really greasy.
Basically the purpose (as well as keeping horse the right way up) was to give confidence
if you do not fear slipping and the horse trusts it's footing, you tend to ride with more purpose and positivity. You can make better use of the dressage arena, maintain balance and power in the sj and stick to tighter lines on xc.
It's personal choice of course but I far prefer to stud cautiously for everything than go without.