By having skills that have a negative effect on a teammate you devalue those skills. Concentration devalues Deorbit use because it wastes the CD of deorbit, does nothing while concentration is up and it already isn't the best skill anyway.
Deorbit will negate concentration, because things like the latency that occurs between players it's very possible for someone to Concentration right as someone deorbits and both skills to be wasted.
If that is indeed "working as intended" (which you don't really get to decide not being the one who created the battle system btw) then we have far bigger problems to worry about involving future skills, mechanics, and balances from the battle team for PvP.
As that is indeed terrible design for a skill , especially when you consider that displacing your teammate is not very positive and may have little effect, every melee has a gap closer and ranged don't need to go very far to continue hitting you, not to mention you can still be hit in the pull/ after the deorbit for a moment.
If it acted as a teleport I could agree with you, but it doesn't, you're not bringing your target back behind a wall with deorbit unless they're positioned in a certain way.
I could probably make a very long post about the demerits of Deorbit and its interaction with concentration , and how that is bad mechanical design /balance if it was intended, and how it is more likely a bad interaction with Deorbit being counted as a "draw-in" effect and being basically the first skill to be a beneficial draw-in.(Meaning they're likely coded the same as a monster draw in-effect, there probably is no such difference in the system between a beneficial and negative draw-in). It's highly doubtful they would intend such a negative interaction, not present on any other beneficial skill in the game, on one job.
I understand you like the skill and that's great, but it really does need improvements.