Honestly, usages vary.
A PC with 8GB of RAM is absolutely fine
for some users - I've yet to see my parents' PC go over 6GB RAM utilisation (and nil swap) even with multiple logged-in users, although it does run Linux Mint which is somewhat more memory-efficient than Windows (750MB used on login vs 2GB), and they use Firefox not Chrome. If you're just doing a bit of light web browsing and other home-office stuff, then 8GB is being entirely usable (even with Windows
![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
). Of course, memory's cheap right now if you're buying the parts yourself, so it's probably worth the extra £30 to put 16GB in "just in case". When you look at retail systems, the picture is a bit different - looking at one of the large retailers in the UK, 70% of laptops they sell have 8GB RAM or less, and going to 16GB can be a £300-500 jump in price as the 16GB models also tend to have a larger SSD and faster CPU (I know you should be able to just drop more memory in, but soldered-in memory is more common than it should be).
I have 16GB in my home PC, and haven't come close to using all of it. I mostly use it for gaming, and photo editing (raw files from a DSLR, generally 100-400 images in a run) - I haven't seen it using even 8GB when doing photo editing.
I'm a software developer, my work computer has 16GB RAM, and is mostly sat at around 15GB used - for some reason the corporate Windows image takes up 5GB on boot, and Chrome uses about 5GB. Running Outlook, Teams, and Visual Studio with containers/VMs takes the rest. Having 32GB would be nice, although I wouldn't be saying that if I didn't have a bunch of cruft using up 3GB of RAM...
Are there use cases for 32GB+? Yup, although I personally haven't met anyone that falls into that category.