1. I don't have the space for a studio. Simple. There will come a time when I will be able to set up a studio but I'm wondering if I really want to. Which brings me to my second reason.
2. I like to tell stories with my images. I like to show my subjects in environments where they feel comfortable and can relate to. Places that mean something to them, or where I can reflect their personality in my images. I've done shoots where people have been plonked in a location of my choice and, although the location has been great, the subjects often take a lot longer to relax (adults moreso than children). And there's only so much a subject can do in an unfamiliar, static environment.
I've seen the results of posed studio shots (as you probably have, too) and, although some people may prefer this style, I usually find the unrelaxed and artificial posing ... well ... awful. Fake. And dated. Do people even shoot like this any more? And when I see these types of images on people's walls, I have to wonder if they are truly happy with them. I know people are prejudiced when it's their own family (even I'm guilty of that), but I would like to think this style of photography has had its day.
So many styles of photography have become cliché: the curled up, nude newborn; the glamourous lingerie-and-make-up-and-champagne package; the toddler cake smashes; the distant-child-in-a-hazy-field. They say a picture tells a thousand words but (I think) these styles fail to do that. In the years to come, these styles - or photographic phases - will serve to date photos.
Environmental portraiture never dates. It's a style that has been around forever. It will never be a phase. It's basic storytelling and can invoke thoughts, questions and emotions. If done right, an environmental portrait can tell a thousand words.