I'm about to take the plunge and mix Android into my iOS life for the first time soon. But I've been mixing and matching other Google services/apps with iOS as well as Microsoft stuff too and I get things done rather easily.Don't know why people would deliberately mix and match android and ios
Yes, they can co-exist but its a bit daft imho.
It's all about the experience each of us has and how the different things fit into our lives. Some prefer all Apple, others all Android and some don't mind mixing things. To each their own.