I never said every Star Wars story has to be the story of the underdog. Leave the Strawman for Dorothy and Co.
I said that THIS story was the story of an underdog. He's on the fringes of the galaxy, a loner without a home. This would be like having a Clint Eastwood western where he's surrounded by the evil mayor's men only to have a zeppelin show up with General Custer and his troops to save the day. Mando worked because it was small and intimate. A hired gun who develops a conscience and turns on the rogues and scoundrels he often works alongside. A dangerous underworld. It isn't the Clone Wars nor should it feel like it.
The Prequels focused on men and women of station and political importance, its not the tale of a scrappy underdog but rather a Faustian tale of a man who sells his soul to rise above his station and climb the ever increasing ladder to power and ambition.
I'd be fine with all types of stories from the SW universe. We could follow the two X-Wing pilots who find Mando in the ice caverns and their episodic adventures. An intergalactic Cops/Reno 911. SW is based upon three genres, the Western, the Samauri Film, and the War Movie. Just as there are tons of different types of stories within each of these genres, so can there be with Star Wars. Heck, they could do a SW gangster story (Book of Boba Fett) or a SW horror/survival story. Its a big sandbox, but you need to know the story you're telling. You can't be telling a SW horror story with a platoon marooned upon a planet filled with monsters and darkness only to have Luke show up at the very end and kill all the baddies. It would be out of place, just like it was here.