HELLDIVERS 2 Tech Blog #2 - Opt-in install size reduction beta (from 154Gb to 23Gb)
(store.steampowered.com)
No the issue isn't with the user having a 400GB drive. The issue is the devs chose to leave 131GB of unnecessary duplication in the game artifacts when published. That is a fundamental problem with software in general but games especially.
Blaming the customer for expecting to have a decent product is laughably misplaced. Part of software being a decent product is it being optimized. This was an absolute failure and they should really be putting out an apology instead of patting themselves on the back.
It's great the game is so much smaller now but it should have been this new size at launch. Certainly not 131GB bigger than it needed to be.