I grant you the right to ask.
But in all seriousness, I'm not really sure where'd I'd go with the milestones other than add the bonus quests. I don't have the ability to work on this in a regimented fashion that would make something like early releases viable for a patreon.
I think that the current system is a nice way to give back for the support, by adding bonuses that don't overhaul the game if you play them but do add extra bits (like FE dlc).
I'm glad you are enjoying the game!
I'm also glad to hear that characters are pretty likable, I think writing is definitely my weakest zone in this game, so I really try to make it good where I can.