You are so off base and it seems like you haven't even played the game yet . Many pins are either right on 45% slopes or just on the edge of it where if you miss by 2 inches it rolls down 30 feet. There is literally no safe place on the green. It's pretty safe to say there has never been a hole in PGA history that was on a 45% slope or right on the edge of it and if there was one that would be the last time that course ever hosted a PGA event.
What makes holes difficult in 4th rounds are holes being placed several feet above a ridge, a hard to get to area that being protected by trees or bunkers forcing you to draw or fade the ball or on a 2 tiered area so a bad approach shot forces you to putt over that ridge but once you get over the ridge it flattens out. The immediate area around a hole (of at least several feet) is never tricked up as to punish a near miss and having it on a 30-45% degree is unheard of.
The hole itself is always surrounded by a generally flat area where you do have breaks and even the more severe ones will never punish the golfer if he just misses. Fast and strategically placed greens is what makes it difficult not making it a mini putt hole where there is no skill involved.