I only use it a couple of times per year, and simply threading it is a genuine challenge for me. So is keeping a stich running. People who sew more or have good fine motor skill may just not remember the noob experience. I expect a lot of new renters to have a learning curve to climb.
it helps to have a good sewing machine - the difference between a poor quality one and e.g. a nice bernina is dramatic. even an old one thats been well maintained will give you many years of reliable use with minimal maintenance, and they're very affordable used
In the United Kingdom, we learn (maybe past tense, I've no idea if the curriculum has changed) how to use a sewing machine at secondary school.