Guild Wars 2

Heart of Thorns will be bringing a number of changes to core mechanics, including profession specializations. While the Revenant profession is pretty much guaranteed to require the expansion and won’t cause any issues, locking specializations behind the expansion could cause a lot of issues. How would PvP and WvW balance work? Are vanilla players just out of luck? Will some features of the expansion be available to all players?

Stormbolt.7293:

Heart of Thorns will be bringing a number of changes to core mechanics, including profession specializations. While the Revenant profession is pretty much guaranteed to require the expansion and won’t cause any issues, locking specializations behind the expansion could cause a lot of issues. How would PvP and WvW balance work? Are vanilla players just out of luck? Will some features of the expansion be available to all players?

I believe its in the same nature of GW1 and its expansions when it came to new skills for classes. Sometimes you will fight somebody with a skill you don’t have access to.