At he moment I'm using Easy OS installed as a frugal on a 32GB USB flash drive.Yes, 4GB is plenty of ram for normal use, I was using only 2GB on some of mine.
I don't worry about browser cache, etc, that stays on the 16GB M2 SSD; what isn't used for the system is used as /home.
I was also running a couple of distros in just 1GB ram fairly recently, & whilst not fast, perfectly usable for day to day tasks.
Linux & BSD just don't need much ram to work, for basic computing.
I'm also using Bookworm Pup64 installed as a frugal install on a 32GB flash drive.
Who needs hard drives at the moment ain't no hard drives installed in my desktops.
Easy OS and Bookworm Pup 64 do everything the big flagship Linux distros do on USB flash drives.