Traditional RTS games require a lot of work to have one cool fight, then usually the game is over. There's so much pressure on that one fight that it's stressful and no fun for a lot of players.
Mechabellum and similar games seems to skip all the hard work and focus on the one cool fight, and they repeat the one cool fight over and over.
There may be some other fun RTS elements that can be reintroduced, like the ability to control units during combat, or some base building.