>>120020732She-Ra ended on a positive note, with happy endings for damn near everyone, and the big bad getting straight-up executed.
We got everything, right down to Seahawk breaking Mermista's mind control not through a big tearful speech but by being so irritatingly flirty that he had her going "UGGGH, WHY ARE YOU LIKE THIS?" Character moments and epic battles left and right.
And it ended in a way that lets you imagine fun interactions between the characters later, be they relationship driven or "further adventures" stuff.
In contrast, svtfoe ended with the main character committing genocide and locking big chunks of the cast into universes they're stuck in. A huge number of characters were just dead, and it wasn't treated in a way that left people feeling kind to the show.
Meanwhile Voltron had the worst possible ending for a fandom. The main cast canonically all drifted away and didn't see one another for years, except for the one that was just fucking dead. The only happy relationship in the end was between Shiro and an NPC.
She-Ra had an ending practically guaranteed to keep fans active and happy, whereas most shows seem to fuck things up in the final stretch.
