I reckon that there's about 4 people in the world who are willing/able to spend £3300 on a groupset but simultaneously balk at an extra couple of hundred for a power meter. If you're a serious enough cyclist to be dropping that much cash on your groupset you're definitely going to be riding with a power meter.
I find that the kind of people willing to drop £3000 on a groupset are the kinds of people that would use their power output as an excuse for being shit.
I reckon that there's about 4 people in the world who are willing/able to spend £3300 on a groupset but simultaneously balk at an extra couple of hundred for a power meter. If you're a serious enough cyclist to be dropping that much cash on your groupset you're definitely going to be riding with a power meter.