Imaro
Legend
For most characters at around 20th level, you'd have 2 at wills, 4 encounters, 4 dailies, and a slowly growing list of utilities - maybe 4-5 at this point? These get replaced as you level up. And this is a quite high level character.
Wizards have 3 extra dailies at that point and 3-4ish extra Utilities. They're an outlier.
Wizards in 5e have a larger and more variable pool of prepared spells, out of a much larger pool of spells known, with none ever being forgotten or phased out.
Ok copying a spell or power down is a one-time thing... and even if you are trading out spells in 4e you are still copying new spells down when you trade them out. I'm just not seeing how 5e is significantly more work or significantly more confusing or whatever than 4e... when it comes to jotting down the spells you need.