Some shops require an appointment. Some, it is first come first serve basis. Wait your turn. Most salons probably require an appointment because of the nature of what they do takes longer. Barbers, not as much.
That's the way it has always been.
Your question tells me you've lost a step or two.
That’s the way it has always been? SORRY
Covid restrictions required appointments be made. Covid restrictions were lifted in CA on 15 June 21