People have many reasons for liking what they do. Just because marketing exists does not mean you can judge someone as being somehow brainwashed.
Some of it can just be nostalgia, and some people might be well aware of that and not, you know, have a "mental illness" because something from their youth evokes nice feeling in them as an adult.
There are plenty of Zelda fans who never played the original or any 2D ones at all, and just love BotW and TotK, even people who are older. BotW was my favorite Zelda since the original, partially since it shared its exploratory spirit much more than any other game in the series (TotK is unfortunately much too similar to BotW, not different enough to present a new experience).
Some of it can just be nostalgia, and some people might be well aware of that and not, you know, have a "mental illness" because something from their youth evokes nice feeling in them as an adult.
There are plenty of Zelda fans who never played the original or any 2D ones at all, and just love BotW and TotK, even people who are older. BotW was my favorite Zelda since the original, partially since it shared its exploratory spirit much more than any other game in the series (TotK is unfortunately much too similar to BotW, not different enough to present a new experience).