If I wanted to introduce someone to the genre then Empires of the Undergrowth would be my first recommendation.
The gameplay, narrative, and progression mechanics are top-notch. The developers understand what makes RTS mechanics compelling and have designed systems that are more intuitive and accessible for everyone.
For instance (no spoilers) unit groups are built-in to base management. No hotkeys or group micro management required. It happens automatically as a functional result of more obvious concerns.
My only critique of the game, if I were forced to offer one, is that the UI can seem a bit clunky at first. That aside though the team’s expertise and care shine through in ways which prove the user experience was well considered throughout development.
It’s fun, too!
Yet I never seem to catch 'em at the local pub.