It's even simpler: when you play any game that saves your progress, losing that save game for no reason isnt cool.Because it's a game of progression and even if there is no real end game there is a feeling of progress. The progression is to get to the type of gameplay you want which is locked behind grind walls. Yes that's real. Losing all of that is a feeling of losing progress. Why would you pretend that doesn't exist and if that's okay with you why do you make any progression at all, why not just sit around and stare at randomly generated planets?
Not much else to say on that front, really.