As always - it depends on the kind of ostensible "serious work" you do.

I've got 32GB and often work with legacy .NET Winform/WPF applications on a Macbook. That means spinning up a Windows 11 ARM distro virtual machine and running Microsoft Visual Studio. The VM has 8GB of ram allocated to it, and based on qemu-system memory pressure, it hovers around ~4-6GB of that.

I also do a lot of colorgrading and video editing with longform 4K videos using Davinci Resolve - scrubbing in an uncompressed format would absolutely thrash the hell out of your swap with only 8GB.