Considering 105 has come in many versions since it debuted in the previous century, you seem to be asking a pretty broad question that likely applies to most any component group name out there.

It's more the issue of what bikes will rub. Differences in the length of the chain stays and whether the most ideal chain line was given by the bike probably has a lot to do with what one person says over another.

105 is a good shifting group set. If it rubs some, that's never been an issue other than those that have to have a stealth bike. My Ultegra rubs sometimes.