Here i wanna talk about my favorite set
Engine Guardian. Sadly it have some weak points, solving which will make it greater.
1.Bugs:
Most annoying thing probably coz it ignored for almost year is bug when EG Healing Restore proc doesn't have aura like other procs:
Here is comparison:

Before IC release this beam worked fine and that how it was and how it should be working: (screenshot from pre-IC video)

Bugs should not exist.
2. Flaw mechanics:
When character is outside of battle - automaton following you with maximum speed and beam is unbrekable:
a. But as soon as your char receiving "in-battle" status - automaton stop follow your char and not moving:
In pvp it means that if automation won't be interrupted and taking in account that mobility is huge part of pvp - if you will move you won't get restore of resources even if set proced succesfully, making it useless.
b. If automaton got hit by range attacks or sieges - sometimes it start to move toward enemy, i.e. breaking restoring beam even if you stay on one place.
If those thing would work as intended, the usability of set would be increased without any rebalancing.
3. Lore/Immersion improvements:
I finding it is weird that:
a. Dwarvern Sphere - damage dealing creature is restoring resources.
b. Sphere shooting beam from its crossbow hand.

So i suggest to make it more lore friendly and not looking that weird to change Dwarvern Sphere model to one that probably wasn't ready during sets introduction - Clockwork Sentry.
a. The name itself "Sentry" fit set's name "Guardian".
b. It not looking like military object and its weapon that looks like laser-shooting gun is looking perfect to shoot laser-like restoring beams.

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@Wrobel since his responisiblity of sets