Definitely not stupid, but you're missing a critical difference in the role that player perception plays into how they feel about each game. Also, the amount of things you have to do to get BIS in FFXIV is far less than the amount of things you have to do in WoW. These differences play into the differences in content.
In WoW, getting BiS is never really a waste for 2 reasons. 1. The Mythic + timer. The better gear you have, the faster you can run the dungeon or push to higher levels. It also gives you more leeway to carry if one of your players sucks. 2. Mythic raids are more difficult than Savage raids. I personally am not super experienced with Savage raiding, but the consensus seems to be that Savage is on par with the first half of a Mythic raid and Ultimates are on par or perhaps even more difficult than the final Mythic boss of a tier. It's quite likely that if you're going to do Ultimate, people are going to want you get try and get BiS, but it's unnecessary for most Savage content. Whereas in WoW raiding, the average raider needs all the help they can get to get Cutting Edge, so they'll want BIS.