HJBold Where did you manage to rent a 2005 diesel Focus from in 2021?
Actually you'd be surprised just how many car rental places offer cheaper and older cars for rent. When I was looking around RAF Mildenhall/Lakenheath, there were many companies offering cars for rent which were nearly 20 years old, mostly consisting of Japanese saloons like Accords, Avensis' and Lexus IS200's. In fact, I've never seen so many IS200's in one area at once!!
Most of the renting is for US military personnel, usually having just PCS'd over and awaiting shipment of their own US-spec cars.
I think it's a fantastic idea to have older cars out for rent though, means they're dirt cheap for the consumer, and you get a car which actually doesn't feel like a white-goods appliance.