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Yeah that was my first reaction when I saw the title, "How hard is it going to be this time?" since it took me 2 days to migrate to the v4 last time.

Why upgrade?

Because if you don't upgrade, you are stuck with whatever version of React created at the time. You don't get stability & performance improvements, bug fixes, you can't potentially install some newer libraries requiring the new version. Not keeping up with upgrades is making the code rot slowly.

Because sooner of later you'll have to. Upgrading frequently minimizes the delta.

Same reaction here! Jumping from 2 -> 4 was a pretty big change to our codebase. Glad for this.

Apparently it was never meant to be a major bump, but they were forced to do it because of a semver screwup between their own packages.

All the changes were already in 4.4.0 published one day earlier, which they've now unpublished it seems.