There are 2 ways to look at the sand bed. First is that it is a dirt magnet that needs to be cleaned. And if that’s how you approach it, then yes, cleaning is part of your maintenance.
The second way is to view the sandbed as an integral, living, breathing part of your filtration system. I subscribe to the second school of thought. I haven’t cleaned my sandbed in my 180 over 20 years. It is my sandbeds job to convert fish waste into DOC’s that I then filter out in other ways. Specifically, I use skimming, live rock and a large refugium with lots of chaeto that I harvest monthly. So there is more than one way to remove waste from your system. Space constraints and budget will likely dictate which method you choose.
In the end, organics need to be removed from the system, either mechanically or biologically. Both ways will work.