Yeah, for those that don't know, you can go into Settings -> Apps -> pick an app -> Permissions and disable them at will. I believe only apps compiled against a Marshmallow SDK version will prompt you at runtime, and there's little (or even negative) incentive for app developers to do that yet.
There's a great incentive on automatic updates. If you updated an app pre marshmallow with an extra permission it required the user to approve the update and that ultimately creates a problem with a large user base stuck on older versions.
Maybe for new apps there's less incentive to reduce access, I can't think about any other than compliance and user scrutinity. It's easy to spot bad reviews complaining about excessive permissions for some apps.
