I'm all about the simple bare excessities.
Seriously, poor form to pick at someone's small error in their second language (how many of us write in a forum in a language that's not our own, and flawlessly?), but actually I'm delighted by the accidental invention of this word. "Excessities" is really what SF is all about: what we consider to be "simple", "getting the basics right" and indeed, "classic and timeless" - the mere baseline, that even in most formal office environments would be considered a vain excess: our "real ancient madders", carefully-selected merino suitcloth, our obsessively-sourced welted shoes and our care in choice of tailor, gorge and buttoning point. Vain, obsessive, extravagant and irrelevant to the many, and yet somehow vital to the few.
These are our excessities. Brilliant word, well done.