Aside from the negligible minutiae of how things are written, there is literally no practical reason to treat origin characters any better than the custom made ones.
The effort that went into the origin stories could have been better used making the tags feel more relevant and/or having more of them.
I'd gladly have a 'merchant' aspiration instead of Ifan as a thing at all.
Totally this.
And honestly Stabbey, ask around, how many people want to have a preset character instead of a custom made one? Larian is bragging about their ability to create pen&paper like rpg games, an effort could have been made for the tag system. This is just a question of how much energy you want to put into this, there's no real impossibility here...