TL;DR at the bottom. Warning: this is a long one!
So I saw all four+ hours of the Specialization AMA. I really like how the system is moving forward and I appreciate that there is some real decision-making involved now with trait choices. However, I’d like to make the following suggestion:
Make Aquamancer’s Training (deal 10% extra damage when your health is above 90% and reduces recharge on all water weapon skills) a Grandmaster Trait, boost the damage bonus to 20% (or 15% with another bonus effect), and turn Bountiful Power (deal 1% extra damage for every boon) into a Master Trait.
Why? Well the new Specialization system is mainly focused on how Grandmaster Traits define/change the player’s play style in a significant, meaningful way. As it stands now, Bountiful Power is, quite frankly, boring and passive. It adds a marginal stat boost (at any given time an Ele generally has only 4-5 boons), and does not promote any new type of playing. Heck, even the Ranger’s equivalent, Bountiful Hunter, is only an Adept Trait! Although I understand that comparing similar traits between classes is not completely fair due to how different their play styles are, I really don’t believe Bountiful Power is deserving of Grandmaster tier.
The only sort of play style that Bountiful Power promotes is to have as many boons on your character at a time. However, there are currently only 9 boons total in the game, and Eles don’t have reliable access to Retaliation or Aegis. Protection, Stability, and Vigor are difficult to maintain, leaving only four (Might, Fury, Regeneration, and Swiftness) boons to have near-constant uptime. These four boons, however, are already at near-constant uptime on almost all Elementalist builds!. They are simply too important and helpful to go without, as any competitive player would agree. They are also very easy to maintain, whether it be through blasting fields, weapon skills, or through traits such as Elemental Attunement or Zephyr’s Boon. That is, no Elementalist, even if they chose Bountiful Power, would significantly change their play style (boons should already be up whenever possible), or their builds (purposely choosing a Trait/Rune that provides a unique boon for a 1% damage bonus is wasteful). Ultimately, Bountiful Power fails at being a Grandmaster Trait.
I understand that the intention of Bountiful Power was to give Eles who went into Water a damage option. Whereas Cleansing Water encourages group-wide support builds, and Powerful Aura encourages Auramancer play, Bountiful Power, however, offers only a pure damage boost with nothing else interesting about it. It also suffers from the fact that it can be rendered useless when fighting an enemy that can remove conditions. When a Mesmer can nullify your Grandmaster Trait just by using their sword auto-attack, or a Thief spamming S/D 3, it seems like bad game design and leads to a bad player experience.
Let’s talk about Aquamancer’s Training, though. Aquamancer’s training does encourage a simple, but strategic minigame. Try to keep your health above 90% to do more damage. The % health mechanic is especially interesting on Elementalists due to them having the lowest base Health/Armor combination, yet extremely high damage potential. By pumping up the damage bonus to, say, 20%, not only is it highly enticing as a Grandmaster Trait (thus fairly competing with Cleansing Water and Powerful Aura), but whole new builds will be designed around keeping your health above 90%, lest you lose a huge part of your potential damage output. It would force glass cannon Eles to put major investment into Weapon Skills/Utilities that prevent damage such as Arcane Shield or Obsidian Flesh, or force them to play a strike at full health, retreat and heal, and strike again play style. Or, you could focus solely on the 90% health part and focus on building Vitality and Toughness, while still having a helpful damage boost. Aquamancer’s Training also heavily synergizes with the Earth Grandmaster Traits Diamond Skin and Stone Heart, due to the nature of their damage-preventing effects. Synergy between Specialization lines is a great thing and was heavily emphasized as such during the stream. Ultimately, by increasing the damage increase portion of Aquamancer’s Training, it becomes a highly attractive Trait that would compete with other Grandmaster Traits while at the same time encouraging unique builds and/or play styles to capitalize on said damage increase. Basically, it would envision everything ArenaNet wants in a Grandmaster Trait.
TL;DR
Bountiful Power doesn’t encourage unique play styles or builds. It is boring, weak, and should not be Grandmaster tier. Aquamancer’s Training encourages making builds and having combat that plays around the 90% health point. It competes well with the other Grandmaster Traits and has synergy with other trait lines (Earth). Buff the % damage bonus to make it Grandmaster-worthy and swap the two.