because its a game and its not revolved around 100% realism lol but in a ways it made the speech crafting skill useless.
That's the logic that churns out bad games...
the speech wheel in oblivion was too simple and you could make anyone have a high disposition to you in about 10 seconds. i propose they completely get rid of it. instead of the speech wheel have npcs give quests that make them like you more. perhaps they want a new set of leather armor for themselves that you could get them or maybe some wolves are bothering a farmers livestock. just some simple quests to raise disposition would be better than the speech wheel in my opinion.
The speech wheel was a much needed improvement to the old speech system. I found it entertaining enough. It really highlighted the fact that we really don't need the speechcraft skill, we can just make them like us by using a minigame. Same goes for security.