Honestly, I think it depends on the rule specifically. There are certain blatantly objective things like lining up past the line of scrimmage, and there are plenty of calls where I do think the refs should have some leeway to interpret such as pass interference.
No sport will ever be perfectly objective. I think soccer is maybe the only one we can say can really minimize the impact of a ref but even that’s BS.
There needs to be some level of consistency between each ref crew but to think refereeing will ever be completely objective is unrealistic.
Baseball definitely the closest, a balk is probably the only call that can’t be made objectively, but it’s such a minor thing anyway.
There’s still a lot of rules in baseball that the written definition of what is and isn’t rule breaking is left up to the umps judgement. Check swings, turning to second after reaching first, etc. Soccer has a lot less rules and they’re less subjective. Plus MLB umps can just do whatever they want without repercussion.
