30 tabs opened simultaneously (with AdBlock, Ghostery and Disconnect), alongside Thunderbird, Emacs (+daemon) and a full DE run up to 1.8GiB of RAM used on my machine, which is everything but fast, new, or fancy. Consequently, I still have 2GB of RAM remaining that are not directly needed (and hence used for caching by the OS).
I'm writing all this from a Core2Duo laptop, so really, when exactly does any computer bought at the same time (or since) have actual problems of running out of memory? I have not experienced such problems in years on anything other than a Raspberry Pi. Is this a problem that really needs solving?
Feel free to point me to use cases where this is essential or useful, for I cannot see any.