I think Bethesda has definitely fallen off in recent years, but I am a bit confused by the point this post is getting at. We learned at launch that Oblivion is a remaster, not a remake, and it's just the original game running under the hood with a new coat of paint and some minor tweaks. And it's a pretty high-effort remaster at that.
I just think it's a bad example to use of how the company isn't getting better, when the point of the remaster was to change as little of the core game as possible. It's as good now as it was back then but it's still a 19-year-old game.
Starfield is what should be killing everyone's expectations of Elder Scrolls 6.