Rental property is typically depreciated using a straight line over 27.5 years.
It is often better to separate property assets by class life and segment the deductions - this will accelerate depreciation deductions - and for most investors, money now is more valuable than money later.
Do you or people you know do it this way?
If not, why do you think that is?
Is it a hassle?
Does it cost too much?
Do people simply not know?
Are they afraid?
This is simply good accounting and tax practice. IRS form 4562 and instructions provide guidance for categorizing assets by expected life span and the acceptable depreciation methods for each. Keeping good records on all capital asset purchases makes the task much easier.