The reverse is also true Declan,
Many UK stations only activate on 60m (often not in the part that we in Europe (including EI) are allowed to use) and UK/EI stations 40m (and 30m CW) and not 20m, so that I have no chance of successfully chasing them from down here in Southern Bavaria.
It must be said however that 20 metres and above are more problematic as if the MUF isn’t high enough across the path - you wont get through - the band may even be totally dead.
As always, activators have the right to activate where they want to and no chaser can dictate otherwise. Often adding another band can mean adding extra weight to the backpack.
Remember an activator only “needs” 4 contacts to get the points for a summit. It is only out of kindness that most activators will work more chasers.
DD5LP (Chaser & Activator).