OK I'll bite....
Why does it need to make a difference? For the sake of clarity

)) let's assume that it does not make any difference. Would there be something wrong with one or the other?
good pun. it's always better to argue with a bit of humorous air floating about.
let me ask you a question:
Firstly, before i possibly offend you, are you a religious person? if not proceed to number two. is so, then you will now know why i'm done with this argument.
2) do you enjoy it when the religious continue to push on the world that it was created 10,000 years ago? do you enjoy it when the religious tell us that certain races, sexes, sexual orientation, etc. are lower than them? do you enjoy it when they you that they're going to have a mansion in heaven because that's the way they have interpreted and experienced God and you can't debate it, because it's their experience?
3) and then do you enjoy it when they further continue to propagate these non-truths (which is the nice way to say a behemoth of a lie)?
4) why do you not enjoy these things?
my assumption is that you likely don't enjoy lies, especially when they're only backed up by a very subjective and unprovable experience. and then if i were correct in that assumption, i would go on to assume even further that you especially don't like it when they go about spreading those lies and basically forcing them upon the naive.
maybe making beer isn't as serious as religion (or maybe it's more serious). but for me, either way, a lie is a lie. i have no problem with religious people believing the dumb **** they believe. but where i stand up and draw a line is when they start imposing that belief on others. they should keep it to themselves.
now beer is not religion. in beer, there's tons and tons of science to back up processes. in the homebrew world that science gets easily skewed by opinion. but i don't see why it needs to stay that way. i don't see why those who believe that beer needs to go into a secondary religiously stick to it when there's tons of proof to the contrary.
if i told you i never controlled my ferment temps, you would likely call me crazy and tell me not that i'm wrong when i suggest to a new person that i make perfectly fine beer and i never control my temps. why would you tell me not to propagate the lie that ferment temps don't matter? because you 1) care about the truth, and 2) would wanna see a new homebrewer practicing the best brewing practices that are known so far.
moving to a secondary vessel is not only 1) proven to make no difference in the final product, granted you've used proper methods up to that point, which means 2) it's not the best practice for homebrewing as far as we know up to this point.
it needs to make a difference in the final product because the point of having a homebrewing forum is to learn and grow and become better brewers making the beers that we're making better and better with time (at least for me), and not to continue proliferating antiquated practices.