There's some truth to this Internet meme which is circulating at the moment - although I suspect more than 5 photos were taken on the moon. After all they took a Hasselblad up there which uses 120/220 film - https://en.wikipedia.org/wiki/120_film
- which at 6x6 gives you 12 shots per roll. But in spirit we know what it's saying.
Taking millions of photos all of which are mediocre seems to have become the norm. I don't object to lots of photos being taken, sometimes it's necessary. But it can make you really lazy at times when it's not necessary and then you become sloppy because "one of them will do".
So for any new photographers reading this and just starting out and looking to improve their skills - here's a little exercise you can try for fun to see what you learn from it... But I think it also applies to those of us more experienced too - you can never be too good at recognizing what does/doesn't need to be captured.
Use a small memory card (or limit yourself to x shots only where x is less than 30). Try and make each shot count. Try to photograph in such a way that there is minimal sorting needed of the results. Just as an exercise - to see what you learn from the experience. Of course do this on a non-critical assignment - perhaps when you are visiting somewhere taking snaps.
BENEFITS: Your compositional skills will improve. You will save time not having to sort millions of pictures. This means when one day you get to photograph something really important but only have a few minutes to capture it - you will be better prepared to nail it! RISKS: Until you become good at it you may miss shots. But far fewer than useless shots you would have taken just mindlessly snapping. DISCLAIMER: Some types of photography need many pictures and rapid shooting - photo-journalism, sports photography etc. obviously this does not apply then.