Yea probably optimization is a part of it. 8gb is the bare minimum you would want in a card and im sure for 90% of the games coming out in the next 2 years it shouldn't pose huge problems at 1080p or maybe even 1440p.I think that if WDL requires DLSS at 1080p on a card with 8GB VRAM then it is an absolutely unoptimised POS. I say that not to defend any lack of VRAM in the 3070, but considering that WDL hardly looks like the most amazing of next-gen games vs something like CP2077, then this suggests me that it probably uses more resources than it needs. I would also be interested to see how it runs without RT at the same settings.
The sad fact is that it's not going to be the only unoptimised POS coming out in 2020/2021 and this will have an effect on cards with lower amounts of VRAM that may not otherwise deserve to run in to performance issues. I mean, I am all for accepting more VRAM usage if a developer actually justifies needing it and you see the evidence with your own eyes, but I resent it when dirt companies like Ubisoft make it necessary though bad development and you end up with a mediocre looking game with bad textured and tons of RT reflections that cause performance to drop off a cliff.
https://www.youtube.com/watch?v=NEoggn32eag&list=LL&index=1&t=132s
It uses around 7gb-7.5gb without ray tracing and without dlss
and runs without any stuttering, but its at the absolute edge. I think the main culprit here is the 20gb hd texture pack(ultra settings) that was recommended to be used with 4k by the devs but every benchmarker and reviewer uses it at all settings.
Without that texture pack the game uses barely 6gb at 1440p with dlss+ray tracing