Actually it only gets worse. When my limit was 5.12 b/c and I had given 4 burns, I could not do a 5.11c/d as a fun last route of the day. When I started doing 5.13c/d I could do a 5.12d as last route of the day to chill out.
In bouldering it's even worse. V4 and v5 feel pretty much similar but the difference between v9 and v10 is a whole dimension. And I my v14 buddy tells me it only gets worse the higher you go. He can do v13 in a few sessions but needs months for a single v14 that suits him.
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