The only time I've used Druid's Braid is when using a 5-3-1-1-1-1 build for PvP, but that's pretty rare.

5: front bar 5-piece set
3: backbar 5-piece set (so only 5/5 on backbar)
1: Mythic on shoulder or head piece (ie Gaze of Sithis)
1: Monster piece set for the 1-piece set bonus
1: Trainee for the health
1: If you don't need 1400 Magicka from Trainee, literally all that's left is Druid

It's rare because it requires you to be using one of a handful of Mythics that rule out a monster set, either not wanting a weapon set or needing a 5-piece set to proc only on one bar (like Mechanical Acuity), not wanting Agility/Willpower, AND not needing that 1400 Magicka from Trainee. I think I used it on one battlegrounds build with Gaze of Sithis lol.

For example, 1-piece Magma Incarnate + Trainee + Druid's Braid is 124 Mag Recovery, 124 Stam Recovery, and 2400 Health. Is that actually worth more than 1700 Max Mag and 200 Spell Damage from Willpower? On my build, I thought so.

It really should require like 1 trait researched instead of 7, so that new players can equip more pieces as a reward for researching. Then again ... by the time players are researching crafted sets, they're way past that point.