I miss it too, but they did a great job of being classic Zelda into an open world. The only way they can truly top TotK is by heavy story and more dungeons, but I'm just glad to have Gleeoks and other classic enemies, dungeon monsters, and side stories.
Maybe classic Zelda spinoffs will be linear stories like Twilight Princess.
I have a 5.1 as well, and I use software normalization (Plex and through my Shield) to fix it. I know there's a way to tune it via hardware, but my setup is an ancient Yamaha receiver and I prefer the software normalization.
Mixing can be a mixed bag, as everyone uses different hardware to master their sound, but normalization or boosting center fixes it 99% of the time.