Gerami ur funny. Plat is still a currency but people find diamonds easier for multiple reasons. A big one would be speed. Its easier to hold 100 diamonds then 500k plat. I have 3.433 speed and i make 28k and i am suddenly down to 1.5 speed. If I had 28k plat in dias and i might go down to 3.3 speed.
You starting to see why dias are more preferred. Another is its easier to buy things in dias. You don't want to pay 500k for a pmop +12...you want to pay 100 dias.