Specialization Skill Mastery states
When attempting a skill check with a skill in which you have the Skill Focus feat, you can take 10 even if stress or distractions would normally prevent you from doing so.
Trick attack doesn't have any unique language regarding its check:
Just before making your attack, attempt a Bluff, Intimidate, or Stealth check (or a check associated with your specialization) with a DC equal to 20 + your target’s CR.
So what I'm seeing is that once an Operative hits level 7, they basically never need worry about Trick Attack checks again. 7 skill ranks + 3 proficiency + 3 edge bonus +4 specialization (TA specific) = +17. So without any stat bonuses, a take-10 allows you to hit a CR equal to your level. Each point of stat bonus, and each point of Operative's Edge beyond +3 lets you hit a CR above your level, which means, unless your GM regularly throws party-level +5 CR enemies at you, a take-10 never misses. (Edit: this varies by specialization, as some do not give the +4, just the non-dex-skill-based ones)
Rules as written, I don't see any reason to not allow this, but it does seem odd to effectively negate the check past level 7. Is there any reason that I'm missing that RAW would not work this way?