why don't you return it back then and buy something better? Isn't there a money-back guarantee for the first X days?
Well, questioning about Linux depends really on what kind of distribution the author used previously. Some are less efficient than others.
Considering hardware, the whole set of AMD Ryzen3 and Ryzen4 based laptops are much better than a MacBook, in computing power, flexibility, energy efficiency and lately also in price, plus they have the advantage that you can later upgrade SSD or RAM, while on MBP everything is soldered and you're out of luck later on.
The day MacOS will be fully virtualized, it might be the doom of the MBP and iMac.
Also, somehow, the "buy-test-return" mentality simply isn't present around Europe, at least never seen it as anything other than exceptional.
But you are right, where I'm from (Romania) people look at me in disbelief when I suggest it, thinking that the companies will punish them if they do it when that's not really true.
Currently I literally only buy electronics from stores that I know deal fast with returns, either via returning the money or replacement.
Edit: In fact, I had way better experiences with this law, in comparison to warranty claims.