Yeah we can only hope for better versions to come that improve battery. I noticed that when I'm on a Teams call I'm constantly between 9-16w, with shared screen 16W usage.Same issue as @MrGunny94 . For that morning I was using the same compliment of apps, native Slack, Chrome and now added native Teams. It's the only new app in the suite of active apps and what is typically a full day or more was measured in hours.
FWIW, I don't have rosetta installed at all. If anything isn't native for me, it won't run.