email them saying:

Hello, Steam! I'm a user of your service that loves playing games, and I love what you brought to us! It makes my PC feel like a console, and I love that!

I am emailing you to ask a question regarding the Steam mobile apps. It always bothered me how the service features are separated into three apps. I wanna know why it's like this, and why not an all-in-one app. Is it a design choice? A way to only download what's necessary to save phone space? I'm very curious.

Sincerely, STEAM USERNAME