Any person or business actually needing 24gb of RAM in a Mac is doing cutting edge computing work and is making 3 grand of revenue at least per day.
God, I wish. My 16gb Mac swapped constantly doing Docker rebuilds, and I was just an SRE muppet making well under $300/day.
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Da Vinci Resolve recommends 16GB for video editing and 32GB if you're doing Fusion compositions. Basic video stuff.
Blender definitely benefits from more RAM. The M-series Macs are good for doing renders. If you're a hobbyist or independent creator, you're more likely to be rendering on your laptop than having a fancy render farm. (That's exactly how the movie Flow was done.)
Musicians know software instruments can eat into RAM, and streaming things like sample-based instruments off of disc is non viable for real time audio. Real world use can have very large numbers of tracks with many software instruments and VST chains. Ableton is a minimum of 8GB for the DAW, and things like Kontakt will multiply that fast.
And people usually have Chrome, chat apps and other things open while they work.