The core mechanics are mechs fighting each other but Lancer's setting and lore focus on the struggle of an explicitly communist state to bring about Fully Automated Luxury Gay Space Communism against myriad threats to the Revolution. There's pages and pages written about the history and conflicts that Union has fought to try and guarantee the promises of the Revolution to every person, and the compromises and mistakes it's made along the way and is trying to rectify. The players can skirt around all that for cool mech fighting without context, but the authorial intent is clear in that player characters should be motivated by ideals, not money, and provides loads of scenarios where they can aid the Revolution (for instance by acting as liberator teams for the Department of Justice & Human Rights by actively dismantling some space fash).

Also, both authors are leftists and they use their company twitter to publish messages like ACAB and Abolish ICE