Not every game is Crysis for sure, but for instance, a lot of AAA games right now require 8 GB of memory minimum. The $400 Surface Go 2 that came yesterday has only 4 GB of memory in the base config, and such specs aren't isn't particularly uncommon. Not that you'd be playing AAA games on that machine even if it had more memory, but hence my point.
Looked up similar hardware running games on Youtube and yup - it's pretty awful even for quite old AAA titles. Bet it still runs league of legends at like 150fps though.
Half-Life 2 was remastered with updated graphics in 2007 when it was re-released as part of The Orange Box. I pulled the original box from 2004 out of my closet and it states 256MB was the minimum required: https://slerp.xyz/img/misc/hl2_reqs.jpg
Half-Life 2 lists 512mb ram as required. It came out in 2004.