In the timespan of an hour?
Or looking at another way, in game timeframe is really pushing it at two years. How much do you forget in that time? Maybe a lot if you spend two years in the pub after graduating, but I am pretty sure the great majority of our Dovahkiin are out there using their skills and perks.
Edit : Grasping for straws?
"I can't do the Dwemer puzzle box". Result : no directions, all quests rely on markers.
"Grinding for +5's isn't fun". Result : instead of a new attribute system that rewards you for levelling up, no attributes save H/S/M.
" I can't do the main quest, I killed this guy". Result : win the civil war for the Stormcloaks, Imperial camp commanders are still essential.
"Spells look rubbish". The spells look loads better, but there are now very few of them.
"You had to make a custom class to play a viable character". Result : not even a single tag skill or single perk at creation, all Altmer start the same, even if you want to play an Altmer warrior.