There's one aspect of PvP that I've tried to talk about before, but it got overlooked. It's something that will become increasingly important over time.
Patch 0.18 increased the experience gained by killing players. Those who don't see why that's significant probably haven't done the "Kill 20 Enemy Players" quest from the mission boards. Every kill performed by your group counts toward that quest; you get credit for your group's kills and by extension, you get experience.
Prior to 0.18, people who leveled in PvP could grow to significant power specifically because it was slower. In ESO, you need skills to advance so that you can unlock later abilities, and the base level for skills help to determine their effectiveness (along with your level). The effect this will have on the endgame is that players at level 50 with significantly advanced skills will be significantly more powerful than those who reach level 50 by experience alone.
Player kills do not advance skills. Turning in quests is all that does that.
This means that while PvE can be ignored in favor of PvP battles, it will result in a gimped character in the long run. Those who run repeatable quests that eventually offer meager experience but still advance skills will grow to be the most powerful. Simply put, PvE in some capacity is required for satisfactory advancement.
It's not an issue worthy of debate or concern, but one that people need to be aware of. The solution for PvP guilds already exists in Cyrodiil; the repeatable quests I mentioned before. The cities of Cyrodiil are full of these. I've repeated several from a NPC in Cheydinhal. The thing that is worthy of debate or concern is just how boring it will get to be farming the same repeatables over and over in order to keep skills up. If you live in Cyrodiil, then you will have no choice.
That should be the way to maximize skills with level, but more entertaining PvE will involve doing more outside of Cyrodiil. That also may help to maximize skills with level because there are so many quests that it doesn't take very long to reach a point where most quests in a zone are below level. So, the most powerful endgame characters will be grinders, completionists, and those who really soak in all the available stories. Those who focus on kicking but in PvP and dominate early on will gradually become less worthy opponents.
Players focusing on PvP need to be aware of this. I hope that there are people on PTS doing regression on skill advancement and xp with some kind of logging if it's to be min-maxxed (despite that going against the spirit of this game) because PvP guilds who commit to larger population campaigns will need to manage this in their expectations of members and there may be times when giving up hours in Cyrodiil is costly.
