John:
With today's types of parts (your already deep into it if you are using three SiLabs (ie Cygnal) type parts) it cannot even be an intellectual question as to whether you will use a supervisor on the next layout or not!! If you see problems with your design get them fixed.

Your post sounds like you are on a long walking trip accoss the hot desert and contemplating that "maybe next time I'll bring along a little water".

Michael Karas