Size – of your lens – matters. Like for travel, where you want a wide angle lens (10-20mm on a crop camera). Or on a portrait shoot, where you want the longest possible lens.
Why? Well, just look what happens when you use a wide angle lens for a portrait. To do thijs, you need to get close. Getting close means that what is cloer to you looks larger (hold your thumb in front of the moon: is your thumb really larger than the entire moon?)
So you get this:
And the limiting factor? Simple – the size of your studio. A long lens means “stand back far”.
But if you have the space, that is exaclty what you should do.