I've gone down this road and I don't think that it's good advice any more. The secret to good photography is having a good editor, someone who can tell you which photos you have are good and bad, and why. Someone you can have a discussion with over a dozen 11x14" prints. Continuous improvement. Develop your eye and shoot neither too many nor too few photos. Every time you go through the review process you get a better sense of what you should be looking for in your photos.
It's so easy to fill up an SD card with nothing but garbage. I've done that. I've gone through bulk rolls (100' of 35mm film) and filled them with garbage I just don't want to see any more. By shooting more than you need, you can easily fall into the trap that because the photo will probably get cut during editing, there's no point to putting any special amount of effort into it. So there's no point in shooting more pictures if you're not putting enough effort into each one that it could be good. When I was at college I remember having discussions where we thought that there was not really any point to going through more than a single bulk roll per academic quarter (18 rolls in 10 weeks, or ~65 exposures per week). People who shot less than that much weren't showing as much improvement, and people who shot more than that were just ending up going through the process a bit too mechanically. That was just a rule of thumb for the classes at that particular place and time.
There are good, great, and amazing photographers who shoot such a small number of photos it would probably shock you, and others who shoot so much it makes you wonder how quickly they must go through equipment.