On what basis may the FAA deny or limit a small UA operator's request for ATC authorization to operate in controlled airspace?

Why: AC 107-2A § 5.10 (p. 5-7): the FAA has the authority to approve or deny operations based on traffic density, controller workload, communication issues, or any other type of operation that could impact the safe and expeditious flow of air traffic.

• Confuses the anti-collision lighting requirement — a separate § 107.29 night/twilight rule — with the operational factors ATC actually weighs when deciding whether to grant airspace authorization.
• Invents a manned-pilot-certificate prerequisite; a remote pilot certificate under Part 107 is what's required to operate at all — the authorization decision turns on traffic and safety factors, not other certificates the applicant may hold.