I for one knew how to deploy Linux applications long before Docker but know nothing about the GPU/graphics stack on Linux which is crucial to game devs, and FWI

I for one knew how to deploy Linux applications long before Docker but know nothing about the GPU/graphics stack on Linux which is crucial to game devs, and FWIW I ran into graphics problems when I tried Ubuntu Desktop (yeah, just the vanilla Desktop, not gaming) on my Nvidia GPU last year, so again your snarky response contains no relevant info at all.