This is plausible - and the best explanation I’ve heard. McGonagall was thinking about this in the context of (and in comparison to) laboratory transfiguration dangers, where it’s just your own transfiguration that’s a danger. Also given the transfiguration speed of an adult wizard, I’m not sure that transfiguration ought to be that difficult in battle—though I agree it’s more difficult than charms.
This is plausible - and the best explanation I’ve heard. McGonagall was thinking about this in the context of (and in comparison to) laboratory transfiguration dangers, where it’s just your own transfiguration that’s a danger. Also given the transfiguration speed of an adult wizard, I’m not sure that transfiguration ought to be that difficult in battle—though I agree it’s more difficult than charms.