As one progresses as a photo enthusiast you have two choices. Either continue to be a dilettante doing this and then that or maybe whatever OR to develop a personal and unique style. If you decide to develop a personal style then you have decided on a specific method.
I'm not being argumentative, honest. Why does a personal style require a single (or even limited set of) film & developer?
My style is not defined by my lens. My style is not defined by my use of filters. My style is not defined by my use of strobes versus natural light. Each of those things is a technique that allows me to express my vision in a specific situation. My personal style is more than the superficial attributes of the image. It is the content, the experession, all those things and more.
Steve McCurry is famous for his images shot on Kodakchrome 64. He has an amazing eye for colour, composition, and making photos that grab you and are still interesting after looking at them for minutes. But he's still working, still shooting, long after the death of K64. His images, now shot on digital without any film emulation software still look and feel like Steve McCurry images. His use of Kodakchrome 64 is no more important to personal style than his Nikon F3 was. To me, equating "personal style" with "consistent presentation" is superficial and ignores the work of Steve Mccurry, Yousef Karsh, Greg Hesieler, and pretty much all the photographers whose work I've consistently enjoyed.
It also ignores similarities to other art forms like music, where artists' can have a consistent style and feel, even when using different techniques in different situations (as an example, listen to a studio recording vs an accoustic set from radio ro club recording - same song but different arrangement, often only a subset of the band, similar
feeling (what I consider style), very different
sound (what I consider presentation)).