my goodness you worded this really well and rly broke down one of the key aspects of what sets this story apart from all the other drivel of isekai-regression-villainess rofan hetslop - like just the fact that the ml isnt just a rival heir vying for the throne and looking to overthrow the current ruler, but an honest-to-goodness antiroyalist looking to dismantle the monarchy is such a Huge thing imo.
like so many other webtoons rly dumb the politics down into "it's not that the monarchy is bad, it's that the emperor/king/duke/whathaveyou ruler was bad!" so we do end up getting revolt-lite and faux-revolution story beats but the characters are never written to question the monarchy and be capable of demolishing that and rebuilding from the ground up. instead they perpetuate this flawed system by just moving the crown onto someone else's head. and like sure i get that the argument to this is that these regression rofan stories are romance-focused first and foremost, and thus serve as the ultimate shallow and indulgent wish fulfillment that doesn't have to go in depth with the worldbuilding, politics, and characterization beyond what's serviceable for the main characters to overcome to establish their romance, but i think its fair game to criticize the fact that these authors want to use the aesthetics of revolution and reform as set dressing without being smart enough to go beyond questioning the status quo and the liberal values in place (hello arcane im also looking at you).
anw sorry for the rant just wanted to say that i absolutely Hard Agree with ur take.

this is among the very few politically and socially logical flow of narrative amongst many that utilise the rigidity of feudal/monarchial based intrigues. a lot of these webtoons were spouting nonsense as their worldbuilding and problem trigger because the romance or smut takes centre stage, so none of the characters actually ever pulled the conclusion that monarchy and birthbased peerages is a fundamentally flawed system. half of the problems in many stories would fall apart if the characters veers towards dismantling it instead of rehabilitating it by putting the crown on a different head.
having the ml be an actual antimonarchist revolutionary is new, and so far smart as hell. good for ingerd (fl's motherland) for having a successful revolt, and good for the author for framing it as something praiseworthy, and for establishing the villainy of the bad guys is because they aim to ruin the revolutions success. ik its naive to think a revolution was won without crossing many lines and new sins against peoples sovereignty being carved, every struggle of power must call for its price, ingerd probably have their own tale of postrevolt bloodshed, but i still wish that the kind light afforded for aiming for a republic doesnt change