Having a concrete pre-show timeline is disadvantageous IMO, a lot of genre fiction works best when there's a loose, flexible framework rather than a rigid in-universe history. Same for when people try to map the galaxy, it's a fun exercise for fans but there don't need to be distances and locations and travel times worked out for the purposes of the actual series.
I still just ignore WW3 whenever I watch 90s Trek, it never made much sense to me. They can sidestep a lot of the messiness of the timeline by just never bringing it up; the only worldbuilding that really matters for Star Trek storytelling is that the 23rd century is abstractly better than the present, and that Earth has joined with an unspecified number of other planets to form the UFP at some point in the (recent or distant) past.