If you want big numbers on social media, you ideally need to post multiple times a day. This is primarily because most (if not all) social media platforms have algorithms that severely limit the number of people each post reaches.
Creating enough quality content to cover one post a day every day is infinitely possible for most bands, even if a lot of the content you see suggests otherwise. Creating enough quality content to ensure you have multiple great posts every day of the week takes a huge time commitment. Even with bands that hire someone to run their social media, most can't afford to pay for that amount of work.
So do you just go for one great post a day, knowing that your reach stats won't go through the roof but at least you will have quality content? Or do you throw anything and everything up online, hoping that in your desperate grab for numbers fans will forgive you for bombarding them with crap?