the half-life anniversary update is reminding me of The Chart, aka what i break out anytime someone tries to talk about first person shooter game engines to me. i had to find this when i worked at Activision to understand why one of the things i helped bug was marked as "Will Not Fix, it's a bug that's existed since the previous quake engine" (it later got fixed anyway).
it's a fun anecdote to bring this chart up and how it's all Quake's fault [not entirely affectionate] but also reminds me of my own despairs over first person shooters and how i'll likely never really be able to play one fully again due to my motion sickness because they're all based on the same tech and large portions of their functionality are all grandfathered in and no one's going to be able to make a game that isn't based on technology that makes me physically ill lmaoo