10% sugar seems like a lot to add to bread. But not surprising. This is capitalism. They want it to taste good and get people wanting more. No different than McDonalds. MCD doesn’t sell itself on being ‘healthy’ they sell it on good times and good taste.
But since linear logical thought is racism, it’s probably wrong for me to say “caveat emptor”. So, we need government regulators to decide exactly how much of each ingredient must be added in order to call something what it is.
Subway can just call it a bun, instead of bread. “triple tripe sandwich with extra cheese on an elongated bun” but it’s the sugar you need to worry about.
You’re so marinated in commercial American-think you don’t even consider there to be anything wrong with it.