I’m looking to be running a game of Uncharted Worlds soon, and I have a question about stats and the advancement system. Namely, most PbtA games I’ve played or looked at let you buy a stat increase with an advancement, and let you increase one of your stats up to +3 if you want. Uncharted Worlds doesn’t let you do either of those things; is there a particular mechanical or philosophical reason it doesn’t?
My players are used to games where they can increase their stats over time, and I’m worried they won’t be happy about the fact they can’t in UW. Would it be game breaking to let them spend XP to increase a stat, up to a maximum of +3, via the alternative advancement rules in Far Beyond Humanity? If not, what do you think would be a fair XP cost for doing so?