1) you lvl up too fast and your offense becomes gimped
2) theres no reward or feeling of satisfaction if you have the best gear in the game by lvl 20.
Instead i wish i saved smithing for 50+ when lvling rly slows down and better gear is harder to find since you pretty much have access to it all.
That said i've ruined skyrim for me. It's beyond boring now and i load up my character only to alt f4 in boredom. Dont make the mistakes i did...