You got it in one , v perseptive
I am also thinking that maybe you only fly one maybe two types ?? If you were flying up to 10 types you would think differently maybe ? There are just so many stories about some of the most experienced pilots in the country having to get new ratings from their own students !!! God forbid if you needed a rating on some of the rarer birds like Allouette / Lama / 430 / Brantly etc you could be on a wild goose chase soon .