I do not believe that you tried to figure out which was more powerful and it was not immediately obvious. MS even made a page comparing them and highlights the differences: one can do 12 teraflops the other 4. One does 4k the other only 1440p.
You wouldn't google Playstation 4 and 5 to find out which is which. I have no idea why Microsoft would do this. Try sending your mother out to buy one. Would she know which one to buy and understand the difference?
The person you’re responding to’s point is that you know that a PS5 is better than a PS4 without cursory investigation because you know 5 > 4. When you’re dealing with mass market consumers, there are many that won’t perform cursory investigations of products. Busy parents, technologically illiterate grand parents, kids with limited internet access, etc.
I believe the point they were trying to make is that the naming is confusing for consumers. Even if you’re aware of the difference, the naming is still confusing. If someone with knowledge of the product can’t figure out the naming, then how can anyone else?
Having to open a comparison page means it's not immediately obvious. Picture an office worker who has one December evening to run through the mall, buy and wrap gifts for the whole family. Opening his phone, googling the differences between X and S, and also between Xbox series X and Xbox one X? He'll just take Playstation 5 instead.
It really isn't obvious at all. In the past, the slimmer model tends to come out after a few years, maybe with some minor upgrades. Having two released at the same time within the same generation is just... stupid.
https://www.xbox.com/en-US/consoles/compare
Yes the names are not as easy to compare as PS5 vs PS4, but upon cursory investigation it's blatantly obvious that the X is more powerful than the S.