Umm… you can print on bare silicone, but only for the hard vat. You should not print bare on the soft vat.
The vats are intended to print with the teflon film layer intact, and the printing surface will last much longer with the film than if you print on bare silicone because resin will react with silicone when it cures.
It is true that so long as you sweep the silicone vat floor occasionally, bare silicone will adhere less to your part than teflon.
However, you should be very careful not to print large objects unattended without sweeping and checking. If the silicone floor should begin to degrade and react with curing resin, you can get some scary failure scenarios like:
I general, I would call printing on bare silicone an advanced technique for use on certain types of hard to print parts. I experimented a lot of bare silicone initially during my first 3 months with the printer, but now I find that more careful tuning of parameters relative to surface area is an overall lower maintenance approach.