The BW limit is only active at 1 and 2 mV/div not at 5 mv/div.
My opinion is that it is only default. With all V/div you can shut BW limit on or off.
1-2mV/div it go on by default but you can shut it off. (Rigol do this, Hantek do this etc)
Personally I do not like these automatic defaulting on the fly. If I select BW limit on or off, scope need keep it as long as I change it by my self. This is normal in (all) "old" professional scopes, specially old good analog scopes.
User is master, scope is slave. User do settings, scope only follow users. Exept "auto setup".
I do not like that scope change my some settings if I change other setting.
If there come conflict settings scope must not change something itself for avoid conflict, it need only disable conflict setting and/or informate about conflict.
But some like apples some oranges.