Saying it's down to the individual B1
Make clear there's no right answer — it's up to each person.
when it comes to C1 — regarding / as far as X is concernedA: Do you think your country is good at sports?
B: Well, when it comes to football, we're actually pretty strong, but not so much in other sports.
personal choice — individual decisionA: Are you going to the gym after work?
B: No, I prefer to exercise at home. It's just a personal choice.
by no means C1 — emphatic negationA: Do you think learning a new language is simple?
B: By no means! It takes a lot of time and effort.
Whether to have kids
A: Everyone keeps asking when we're starting a family.
B: When it comes to that, it's nobody's business but yours.
A: That's what I keep saying.
B: It's a personal choice, end of.
A: And it's by no means a given that everyone wants them.
Diet advice
A: My cousin's gone vegan and now she's on at all of us about it.
B: When it comes to food, people should just mind their own.
A: Exactly. I eat what I eat.
B: It's a personal choice at the end of the day.
A: And cutting out meat is by no means the only way to eat healthily.