About 10 years ago I was like "FINE, clearly 512MB of memory isn't enough to avoid swapping hell, I'll get 1 GB of extra memory." ...and that was that!
These days I'm like "4 GB on a single board computer? Oh that's fine. You may need that much to run a browser. And who's going to run a browser regularly on a SBC? ...oh I've done it a lot of times and it's... fine."
The thing I learned is that you can run a whole bunch of SHIT HOT server software on a system with less than a gigabyte of memory. The moment you run a web browser? FUCK ALL THAT.
And that's basically what I found out long ago. I had a laptop that had like 32 megs of memory. Could be a perfectly productive person with that. Emacs. Darcs. SSH over a weird USB Wi-Fi dongle. But running a web browser? Can't do Firefox. Opera kinda worked. Wouldn't work nowadays, no. But Emacs probably still would.