Which is precisely the problem. The average customer will just watch one or two reviews which are typically from the US and just go to a store and buy one not knowing that the phone they are buying may not actually be the exact same as the one the reviewer has.
I disagree that it doesn't affect most people. Yes, the performance difference is probably not going to be noticed unless you are running benchmarks, but things like overheating and battery life are very much noticeable by the average user. Iirc, the exynos version of the S20 and the S10 had 1-2 hours less screen on time compared to the snapdragon version, which is quite significant and is going to make a difference even to the average user who has no idea what an exynos is.
If you are spending $1k for a phone, you should know exactly what you are getting, even if you are not very tech savvy. An iPhone from the US is no different than an iPhone from Europe, the same should hold true for samsung phones.