I've never worked anywhere that OKRs are actually taken seriously or followed through. They'll get rolled out with a big hype, people will fill them out with varying degrees of diligence and understanding of how OKRs are supposed to work. 3 months later they're already forgotten and out of date. Some managers will try to keep it going for their teams, because that's what they were told to do, but that'll peter out on…
I've had a similar experience with OKRs. The issue becomes how often to review and update? On the surface, OKRs seems like it would be a helpful tool but in practice it seems pretty cumbersome and only moderately useful to guide goal directed action.
An OKR is about a paragraph of text per quarter, hardly seems cumbersome.