I wonder if part of the reason why Odyssey isn't mentioned as often as Breath on gaming forums is that most bloggers/developers/etc are just generally much more interested in open world RPG/sandbox/etc games right now, with 3D platformers largely on the wayside?
Also, in fairness, Breath did some things that aren't generally seen in open world games, while Odyssey is a (much, much better!) version of Space Station Silicon Valley. Admittedly, I doubt most people played the latter, so that could be completely off track.
I think the key difference was in how groundbreaking BotW was. It shifted the perspective of not only what a Zelda game should be like, but also the open-world genre as a whole.
Odyssey didn't really do any of that. It doesn't do much new compared to previous Mario games, it's "just" a really good, modernized and expanded version of the SM64 formula.