I should maybe add that there is no way to change the default for existing users. So, if they had Super + A for something, on upgrade, this is not an issue for the unity session as it's a new profile and Super + A will give the new shortcut we decided, but on the classic session, as it's the same old profile (gold rule, keep user configuration), Super + A will still be assigned to expose all windows from all workspaces.
Having two shortcuts doing different things on different sessions can be considered as bad.
I should maybe add that there is no way to change the default for existing users. So, if they had Super + A for something, on upgrade, this is not an issue for the unity session as it's a new profile and Super + A will give the new shortcut we decided, but on the classic session, as it's the same old profile (gold rule, keep user configuration), Super + A will still be assigned to expose all windows from all workspaces.
Having two shortcuts doing different things on different sessions can be considered as bad.