As a one man band or small business mobile only as that's the best to txt customers and be texted or called whilst we are out.
If I had a larger business where I was sat in an office 9-5 I would have landline only and be able to take calls during work house. That would also mean I'm not pestered on an evening.
So there that's the difinitive answer.
I think you are spot on. All references to a mobile number are gone now. I’ve recently made the final move which was to remove the number from outgoing day before texts. They now have to phone the landline which gets switched off at 5:30.