That's just the easy way to send most of the braking power to the front wheels, put crap brakes on the back.
Precisely, you want to drive with any question mark over breaking performance - well I prefer not to.Actually, drum brakes stop quite hard. Except under repeated use. The real reason they are inferior to disc brakes is poor heat dissipation. They heat soak under heavy use and then don't stop well until they've cooled again.