Being attractive helps you in everything. Humans have a fundamental positive bias towards those they perceive as attractive.
At the risk of sounding arrogant, let me share my personal experience. Over a period of a year in my early thirties, I became more conventionally attractive by: purchasing clothes from StitchFix (a styling service), getting my hair cut regularly by a stylist, adopting a regular grooming routine, and exercising (especially weight lifting) frequently. Prior to this I dressed like a negatively stereotypical engineer with baggy/unstylish clothing, little to no grooming routine, and little to no exercise.
People of all sexes and sexual orientations unquestionably treat me better than they did before. They are more open, more willing to give me their time and attention, quicker to trust me. I’m given favors like extra services (a barista telling me I can cut the line and give her my order directly), or small free things (bartender comping a drink for no reason). And frankly, people just look at me more. I used to feel completely invisible walking down the street, never catching anyone’s eye - not the case anymore.
Because the change happened over a relatively short period of time, and because I spent my entire adult life prior not engaging in these intentional efforts to be “attractive”, the contrast was extremely obvious.
There is a dark side to all this that I’m not going to get into, but I will say that having experienced the contrast I do feel motivated to maintain some level of attractiveness for the preferential treatment.