Well we know that if you build yourself right you can make yourself into a role. Whether that be tank, healer, DD, buff debuffer, or even CC is possible. When the new UI gets put in I hope it only allows 5 to 6 players to a group. Then bringing tons of people isn't going to work anymore and there will be more group planing and who will be doing what roles in said groups. Another words allow for more group Interdependency which would make grouping more fun and interesting in the open world but even more so in dungeons.
Always having healer-tank isn't interesting, either.
I have played many mmos with specific roles or every class can do everything. If mobs just sit there and take hits, I find the specific role games more fun. Learning how to work with others is always a challenge and for me more fun. If mob AI is more like players, specific roles are definitely more fun in a group. I also agree with Crissa. Healer/tank roles aren't always fun either. The best of both worlds would be to have maybe 4-5 other roles a player can play besides healing/tanking and increase mob intelligence.
The major advantage in this game is that it is hard to make a mistake with your character. Getting fed up with being the tank? Just switch to other skills.
You will always have people that are "better" geared, they put more time in and optimise their gear. I really really DONT want people to be handed gear etc. That screwed up too many other MMO's due to whining kids thinking that they should always be given everything without working at it. I see the results of that in work all the time.....
If my luck is typical in this game, once you turn 60/60 you will get a purple or yellow piece of gear that actually matches the skills you are using on your hotbar 5% of the time. Now that I'm finally leveling augmentation and transmutation, I'll be able to change better gear in the future. Good hasn't been handed out easily to me at all. I'm been 60/60 since around February of 2015.