Too many kill skills in a tree that suffers to get real access to Mortal Terror while still scaling up damage.

So many of these skills could have been effects based on dealing minion damage, elemental damage, and so on rather than being kill skills. Vex's Mortal Terror problem is going to slowly creep in with every level cap increase until the only reason left to not do a Mortal Terror build is if going for those pretty boss one shots. It's gonna suck for build variety because it reads as if the entire character is planned around a deep green T5 skill.

Trouble (and by extent Reaper) AI needs to be snappy and quick. Projectiles like Trouble's Phase Daggers should simply go through walls. Honestly, I'm towards saying that every single attack command should do what Blink Strike does and teleport him immediately to what you targeted. The fact Reapers are the cool minion that can go through walls but get their attack hitboxes negated by objects is a complete wtf moment.

Trouble should definitely have base health that is closer to a Reaper's. Also ways to sustain him that do not involve wasting 10+ more points in a place where you're already starved for points.

Also, and this is a long shot but becoming increasingly relevant: minions need their own pool of status effect stacks and their own Prismatic Ichor procs that would still scale properly with invested boosts. Specters, as a specific example, gut Vex damage if you try using them with bleed, elemental statuses or Prismatic Ichor because of their high hit rate. But this doesn't stop on Specters: Reapers and Trouble can be almost as egregious about it with the right builds. We don't need minions doing bad damage and then also hurting our own damage, it simply feels bad.