puzzles are unfair


Also it is true that at high puzzle rating (like Fetoxo's 2500+) there is significant difference between points you get for solving a puzzle (typically +5) and not solving it (typically -15)
This is not the case for low or average puzzle rating (like thereturnofthesnowfox's 1400+)
Btw, the problem is quite old:
https://www.chess.com/forum/view/general/why-puzzles-often-only-5-but-15