Surely, mastery develops over time and the beauty is that we can learn new things in between as you said

I hate routines too, but I have come to realize that being a jack of all trades and master of none isn't a good way to live

I know there are genius that can do that and it won't defeat the purpose of their lives, but they are rare folks

So for the purpose of mastery, it's important that the rest of us repeatedly try to be good at something