Why does Aram give MSI tokens, but 3v3 flex doesn't?

As said above, you dont get tokens from 3v3 flex, I feel like this is annoying as I have reached gold in 5v5 flex and plat in solo queue, and since getting gold in 3v3 is my next step, I want to play it, the only problem is I'm losing out on loot! Riot please change this, I want to gain a little tokens when playing this game mode.
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