They have it in Spvp.
You play and gain glory and its character wide.
You decide you want a change and try another class and you have access to the same level of glory on that toon as well.
I enjoy playing a different class every now and then i get brunt out and want to try something different in WvW. but its a pain in the butt to be useless with no wvw skills on my new level 80 character that just stepped in WvW compared to someone who has the guard buffs and defence against siege. >.>
Also most ppl have enough points to unlock most of the skills so even if the points you invest in one character is carried over i dont see the problem with make the increase damage to gaurds on all characters because you already unlocked it
