All the core tools are actually a single executable with many symlinks to it, which makes the distro very compact. This makes it very nice as a base for Docker images.

https://en.m.wikipedia.org/wiki/BusyBox

I have no problems currently on my personal computer with 16GB. If RAM is ever an issue, you can always upgrade (especially if you leave slots empty). Plus RAM generally has a tendency to get cheaper over time, so why waste money now?

I think it was some sort of FTB skyblock.

Pretty similar timing to me, and the only reason I upgraded was Minecraft modpacks.