Pedantry aside, I'm aware of the arguments. I suppose I prefer to think for myself, even if it does involve some iconoclastic cogitations.
What I've noticed is how flowering times are often wrong, and I'm certainly not the first to notice (or write about it on a forum). It's as if the breeders and sellers are going by the end of stretch and the appearance of flowers. It's also interesting how the stretch is so like vegetation. You said it yourself: "don't start flower nutrients on the larger plant until around day14 of flower." The ideas in the statement disagree with each other. Why use vegetation nutrients during flowering? Well... The best answer is, it's not during flowering. Vegetation nutrients are used because stretching is part of the vegetation stage. Flowering nutrients are not used because the plant is not yet in the flowering stage.
Some growers are now using a progressive light duration change. In that case, there isn't a specific flip date. The duration is changed over many days or even weeks. I don't see how your overnight method would be applied in this case.
Anyway, I surely didn't mean to argue, but I never have liked "we've always done it that way" as an answer. Sure, the old ways are often valid, but not always, and strict adherence to them can lure a person into habitual absence of thought.
Terminology aside, we still haven't looped back to asking the OP what type of nutrients they use--or how that matters.