Indeed - but you would certainly want to make sure the engine is up-to-date.
Why?
If a product does everything you need it to do and it's stable, what's the benefit of 'upgrading' to a newer version if it doesn't add anything you need and may introduce new problems and bugs?
Vista is arguably more "up to date" than XP is too, yet the industry at large is taking a very precautious stance at upgrading any time soon