It indeed depends on the user. For someone who just wants to use a MacBook Air for web browsing, email, instant messaging, light video watching, etc. then 8 GB of RAM should be suitable enough.
And yes, when ordering my M1 MacBook Air last spring, I configured it to come with 16 GB of RAM, because I do a lot of digital media work. And unlike its' Intel predecessors, the M1 MacBook Air (at least with 8-core graphics) comes very close in speed and power to an M1 13" MacBook Pro with the same specs. This is exactly why I ended up springing for an M1 Air with the 8-core graphics, 512 GB SSD, and of course 16 GB of RAM, and I couldn't be happier.
Though once I get my first Apple Silicon desktop (either a Mac Studio or a higher-end Mac Mini with M2 Pro chip, if that ever comes out), I'm going to configure it with 32 GB of RAM, as with the kind of multitasking and audiovisual production I do, I doubt I'll ever really need more than 32 GB.