All cars still have thermostats for two reasons, you have access to cabin heat quicker and motor oil, even synthetics have an optimum operating temperature range at which the oil performs to spec. A slow and steady warm up period also allows the different alloys within an engine to expand to the dimensions reached at initial break in. If you have time, let it warm up, if you're running late, get on and ride, it's a matter of choice, circumstance and respect for your engine.
