Here's some good news: battery and data usage MUCH improved!!! :)
Wow - I decided to bite the bullet and test Maguss on the two morning walks I take every weekday morning. When I first got Maguss I had Maguss up during these walks, but only for 2 days. I saw what it was doing to my data usage and battery, and it was 10x worse than Another Very Popular AR Game, and stopped doing it.
Today, wow, about 4-5 MB total for the two walks and only 2-3% battery per walk. (These are two 0.8 mile walks I take while at work during the early AM hours.)
This is on a Google Pixel, running Android O, on Project Fi.
Kudos for this massive, major, OMG, fix!