Rapid iteration as a potential source of improvements is great for startups and new things in general. Word, which you teach your grandma, is NOT a startup. Startup needs to change fast or it will die, and they depend on early adopters who want something new. Word needs to think about it's huge audience that doesn't want anything to change. Remember ribbon redesign and pushback it received?

These two types of products need completely different approaches to product development. But also, don't teach your grandma Notion - Word's a much sensible option for her.