Wow there are a lot of ridiculous comments in this thread. Apple's memory architecture has essentially nothing to do with how much memory a particular user needs. There is no magic silver bullet in the M1 or any other ARM architecture that means it needs less memory for user workflows (outside very specific ones that normal user software simply doesn't run in to).
The RAM they are using isn't some magic RAM either - it's standardised RAM chips. Yes, they have shortened some communication pathways by sticking it on the same package, but ultimately that's a design choice more than anything else - there's little technical reason why they couldn't allow for upgradeable packaged RAM here (even if doing so meant a small performance downtick - and make no mistake, it would be small).
In 2020 8GB is barely enough to keep a performant machine running MacOS for anything but the most basic users who are running a single task at once. That's surprisingly few people these days. Clearly nobody has been watching just how resource-heavy the modern web has become - the whole "oh i'm just running a web browser" thing is nonsense - web browsers are incredibly resource heavy, as are all the modern JavaScript-based apps via electron and the like. A very large number of users will be running at least one of these - Skype, Facebook Messenger etc.
Let's not also forget the increasingly large set of background tasks that occur - search indexing, photo indexing, caching, metrics publishing, unattended updates etc. You only have to look at the trends, which are higher resolution graphics, more client-side processing on web properties etc to realise that 8GB with no upgrade path puts limitations on the machine even for basic users.
And it's not just that - these machines should be allowed to have a life beyond their original owner or their original purpose. For all the 'eco friendliness' Apple tries to convey, limiting their machines in this way is one of the most environmentally damaging things they can do. The used market for macs turned into a hellhole after 2013, and it's still common to see 2012 maxed out fat unibodies sold in preference to limited Retina MBPs.