The replies to this make it clear that people want to be ignorant of the actual situation. Usually, you are in rooms with other people who you don't know or trust without a secure place to put your belongings. You can only sleep at night and have to leave during the day. Different shelters have different rules and occupancy and you might have to go to several to find one with an opening. During the day you have to find places you can be that you won't be harassed. Repeat. Imagine trying to do this while dealing with medical issues or just shear exhaustion from having no stability.

Living in a tent sounds preferable from constantly being on the move. A shelter does not mean you have dedicated space to be in whenever you want.