Thank you. I was planning to get the new M2 Mac Mini to replace my folks' old 2011 Mini, which, btw, only has 4GB of RAM and 128GB of SSD, but still runs smoothly for the basic tasks* it is used for. Still, I was wondering whether I should get the 16GB RAM just for the future proofing, but I guess it's not neccessary. One option of course would be try to get the older M1 Mini with 16GB of RAM from a discount, but I doubt it would really make a difference.Completely disagree.
Sorry but nothing you've said sounds close to reality to me.
First off, the RAM cliff hasn't been an issue for consumer PCs since 2010, not sure what decades you're talking about. You can use even 4GB on a PC for basic tasks such as the ones described, but surely won't be great for multitasking. 8GB has been a standard for years now, if the tasks stay the same, you don't need more.
There used to be a myth of RAM making your computer faster but... it had to be the bottleneck and not it very rarely is nowadays.
Specifically about the M1... have you tried multitasking with it? The way it uses the RAM was one of the greatest features, it has great cache and also uses the very fast SSD as swap in some clever way. Been stressing it for a long time now and the only time I ever felt like I could use more RAM was with After Effects with... RAM previews. A very specific task that just works better with more RAM. But that's not what was asked here, and frankly not even what the Mac Mini is meant to deal with, it's not a ideal for professionals.
On the other hand, cloud and external storage are never as fast, practical or reliable as internal storage. Some apps, cache folders and libraries only run (or only run decently) from the boot drive. That's something all users can end up needing.
*= Basic tasks in my folks' case is just that; web browsing, printing something every now and then, online banking etc.