I think you meant 128Gb ram, instead of 18gb.
These days, I'd want 64 GB as a minimum but I suppose 32 would suit for some tasks. I still muck about with some modeling that hasn't been shunted off to the GPU, so I'd even find a use for 128 GB.
A few browser tabs, email client, IDE, and Slack are going to eat up a goodly portion of 18 GB.
Also, 18 GB was certainly a typo, if you look now, they are saying 16 GB now.
Tangentially related: It's a bit of a strange feeling to recommend 32 GB of RAM as a base amount. My, how times have changed.