Consider this analogy:

The Landlord/Tenant relationship is governed by a somewhat complex and always specific set of state and federal rules; much like the operation of a wide variety of motor vehicles upon the public roadways is governed. But who would advise new and inexperienced drivers to simply take the car and start driving?

Suggest they not worry about passing the drivers licensing exam based on the ability to demonstrate an understanding of the rules of the road? Recommend they just head out and drive? Tell them to use their common sense and to remember that as a passenger, they are already familiar with what other drivers do in specific situations?

The new, inexperienced or uneducated Landlord, who thinks they can conduct an effective and legal Landlord/Tenant relationship based on their past experience as a Tenant or having observed from a distance other Landlords and what they do, is no better prepared than the uneducated driver. While the driver will likely hit something and dent some metal, unprepared Landlords stand a greater risk of getting hit in the pocket book!