I think they've been trying to phase in RCBO's for a long time. It's obviously more convenient if the RCD only trips on the circuit it's protecting rather than leaving you in the dark because the kettle has some water in the base. As a landlord it buys you time if you have a fault on one circuit but you can work around it for a couple of days rather than having to get someone out immediately to restore power to half the property.
I don't know the difference but we have different circuits for different stuff. Why would an RCD tripping on the underfloor mess with the lights or whatever? What do RCBOs do - turn off everything?
I think they've been trying to phase in RCBO's for a long time. It's obviously more convenient if the RCD only trips on the circuit it's protecting rather than leaving you in the dark because the kettle has some water in the base. As a landlord it buys you time if you have a fault on one circuit but you can work around it for a couple of days rather than having to get someone out immediately to restore power to half the property.