This thread makes me nostalgic for the 1970s and 1980s, when flash was out of style, available light was in style, "medium speed film" meant 64-125, "fast film" meant 400, and people bragged about the maximum appertures of their 50mm lenses, not about zoom ratios.
I own two flashes. I probably use them for one picture out of every thousand, on average. Except for the one on my new digital camera (which I normally keep in "flash supress" mode), I neither own nor want a zoom lens. My fastest 50mm is f/1.4; my slowest lens is a 28mm f/3.5, and I can reliably hand-hold down to a shutter speed of 30 (15 or even 8, if I'm lucky). If I want to take pictures under hostile lighting conditions, I shoot 800-speed film. Otherwise, I shoot 100.
I rarely use flash at all; I absolutely, positively NEVER use it in museums, churches, or anyplace else where it might disturb others. Using flash under such circumstances is the single most boorish thing any photographer can possibly do.
While I was touring the Art Institute of Chicago (without a camera, although they permit non-commercial, non-flash, non-tripod photography of their permanent collection, surprising for an art museum), I watched a guard repeatedly tell the same visitor to stop using flash, then I gave the guard a knowing look, remarking, "You'd think these people would realize how lucky they are to be allowed to take pictures at all in an art museum, and how boorish it is to set off a flash in any museum."
Quite a few years ago, back on MY coast, there was a Disneyland Railroad conductor who, as the train entered the Grand Canyon/Primeval World show buildings, would say in so many words that the plate glass would act like a mirror, and if anybody took a flash picture, all they'd get would be a picture of the flash reflection. Likewise, at Griffith Observatory planetarium and Laserium shows, it was fairly common for those in charge to warn everybody that if they used flash, all they'd get would be a shot of a blank white dome, and a bunch of irate people hunting them down after the show.