In many ways "street photography" has expanded since its roots. Even color is an issue. Traditionally I think street photos were shot with a basic camera with a fairly short lens and generally in black and white. Most of the answers here seem to support that and I think there are good reasons.

I am looking for my own images and I have always shot street scenes/people with a longer telephoto (Tamron 18-400 on a Nikon d7100--at close to 400mm). Maybe more like wildlife. I usually shoot during the day so there is ample light. The advantage for me is that I can shoot scenes with a lower probability of influencing the scene at this range. While now and then I get dirty looks I basically don't get involved in really angry subjects.

Anyway, this is just one more way of looking at street photography.