My main problem with it is the namespace ambiguity, especially with respect to plurality. For simple statements it’s fine, if you’re saying something about one person it’s going to be clear they are the one you refer to. If you’re talking about their relationship to a group though, unlike a singular pronoun it is no longer explicit that you refer to them but not them, for instance. You compensate for this by making sure your meaning is clear in other ways and it can be made to work, but the fact you have to put in extra effort to make up for “they”'s relative lack of structural utility is a serious problem with the word.
I still use it for lack of a better way to avoid implying knowledge/relevance of gender, but it would be nice if some overtly singular gender neutral pronoun like xe would catch on.
The idea of being a loser or winner in life, and that there is an objective consensus that could accurately rank your value as a person, is fake. People as a whole don’t take the time to come to agreement on what matters, they don’t understand each other, and you don’t have a ranking, even theoretically. It’s only in your imagination, so make an effort to cut some slack and imagine yourself in a kinder way.