They do not feel like they should take up an exotic slot; and their jobs can easily be done by many other things in the game.
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The warlock glaive has 4 shots and deals sh!t damage. To use it's perk you can't even block at all and the turret has sh!t range and is just random af. I'm better off using boots of assembler with lumina if I want to be a bored af healer. Healing in this game is a stupid concept anyway because you're either full health or insta dead. The turret is too slow and unreliable. The titan one at least blocks damage (don't know how much though) and the hunter one chains damage and naturally is the most useful of the 3 but even then trinity ghoul does that job way better with less hoops to jump through. The glaives are a meme.