I think the need for matrix is a bit exaggerated. I've shot many slide film on my life and only one (1) of those occasions was with a matrix meter (the one on the Canon EOS 5). I've shot slides mostly used centerweigthed meters, handheld meters, and using the 80/20 meter of the F3, and I never had any problem.
For street photo just use the centerweighted meter with the appropriate exposure compensation and you'll be fine.
I don't use matrix all the time. I just like to have it there for a few specific situations. I've shot some nice slides with an FM3A, too. It's not a matter of need, it's just another tool in the box. But I do use it, and it's pretty darned good on the F6. But the truth has always been that a good meter is what it is, you understand it, use it properly, and you can get nicely exposed shots by doing so.
Also, I use matrix for other odd things that are probably just me.
For example, I'm learning the quirks of film again after years of digital. I've been going back to exposure and trying to understand it differently of late, so sometimes it's fun to shoot matrix and reshoot making my own decisions using spot with manual compensation to see how the two shots come out differently. Especially with slides, things can look very different if you decide to go a stop in either direction, but I enjoy a more intentional test over just bracketing the shot.
Also, if I'm sitting around and see an interestingly contrasty scene I tend to look through the camera, see what the matrix says, switch to spot, choose various areas and see how they relate, etc. Doing so has taught me a great deal about exposure. I do the same sort of thing with a handheld meter, just when I'm bored and there's nothing I want to photograph around.