Yeah, same in USA in regards to most people using real estate agents. But lots of people are sending letters right now due to the supply shortage. This is a more convenient way to do it.

a) you can do it entirely from your computer

b) you don't have to drive anywhere or go door-to-door

c) you get feedback on who opened and read your letter

d) you're guaranteed it'll go to the homeowner, not just the tenant (if it's being rented out at the time)

e) you get a professional introduction that signals to the homeowner that you're serious; more so than someone that just prints off 50 copies of a letter on their home printer and drops them like flyers on doorsteps.