Hi Dave,
What we might want to do for now is make libappindicator3 an option, rather than a fixed dependency. I'd be inclined to leave it as a default-enabled option for now (which we can change later), but it would offer a choice.
I think this is a good solution. And keeping the option enabled for now. Dependent on how py3 migration of packages progresses until EOL of py2, we could then simply switch the option's default value to 'disabled' next year. Ben