They didn't optimize it for consoles either. Series X has equivalent of 3060 RTX graphical grunt, yet it's capped to 30fps and looks worse than most other AAA games that have variable framerates up to 120fps. Todd says they went for fidelity. Has he played any recent titles? The game looks like crap compared to many games from past few years, and requires more power.
The real reason behind everything is the shit they call Creation Engine. An outdated hot mess of an engine that's technically behind pretty much everything the competition is using. It's beyond me why they've not scrapped it - it should have been done after FO4 already.