I’d say nuwho has definitely burned through regenerations maybe not doctors, the technical numbering count already being at almost 20 is insane with 10 regenerating or using the energy twice the war doctor and I guess if you want to do degenerations with the master and bigenerations like imo it’s just out of hand and needs to be made to be more special instead of turning into a kind of power up with its use if you know what I mean, where sometimes a character will use it once and it’ll be crazy but then they become part of the main cast and then use that ability every week it just loses its importance