David J wrote:

The main disadvantage is that
during the day, when the front door is unlocked, anybody can simply
open the front door and walk in!

Then lock it when you've come in. Not that burglars go round trying
front doors on the off chance - they go round the back. Only something
like 4% of burglaries are through the front door.

--
Scott

Where are we going and why am I in this handbasket?