So you're saying you can't tell the difference between a bushing that needs to be replaced and a good one?
That explains a lot...
Rubber does oxidize just sitting around, that's true. But oxidized rubber is also something you can identify by inspection.
What's the harm in having the OP post a picture of his LCA bushings, or explain the process he used to determine they were "tight with no slop" to see if it was a reasonable process?
I mean if I had the LCA's off and didn't know the history of the bushings I'd replace them. Heck I replace brand new rubber LCA bushings because there are superior performing options out there to replace them with. But I'm not the OP, I don't know his situation, and you can in fact determine if a bushing is any good by inspection. It's the same process by which you determine that a bushing needs to be replaced, and mechanics do that all the time don't they?