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I think some horizontal prog at 50 to buff/specialize/augment/flavor class abilities would be cool as part of legendary quests/dungeons/drops etc. so the continued time invested in your character continues to flesh them out and reflect the depth of your world experience/exploration.
Glad to see Vanguard on the list. This was one of my all time favorites and I still pop on to the private server from time to time, though there's usually a max of 2 others on at best.