Steam has a robust marketplace, with user reviews and a slew of sorting and shopping cart features.
Steam has friends, chat, voice chat, and group chat.
Steam has built-in, turnkey stream broadcasting of games.
Steam allows friends to drop in and play a game cooperatively with you, even if they don't own the game too.
Steam has remote play with friends.
Steam has remote streaming to devices around your home, and big screen mode so you can plop on the couch and enjoy an optimized UI and a gamepad.
Steam has robust gamepad support and configuration.
Steam has industry-leading Linux support.
Steam has VR mode, with custom spaces, interfaces, and a market of useful tools and mods to enhance the experience.
Steam has a music player and a built-in web browser.
Steam lets you add non-steam games to your library for convenient access.
Steam has customizable user profiles and fun social features, like card trading.
Steam has experimental mods and features via Steam Labs.
Now, ask yourself, how does it feel when EGS coerces players into using their inferior storefront through strongarm business practices.