The larger cables tend to have strength members with higher physical bend radius restrictions, i.e. you can't bend the steel or kevlar elements that tightly without breaking things.

Those are more of a technically no?

Like I have fiber to the house and you really need to pinch it and whatnot to cause an internet outage.

A small bend radius means it can have a tight bend.

A large bend radius means it has to be a big bend.

A 7.5mm bend radius is really small. You can bend that stuff pretty tight before you create a problem.