If this was related to the fire, and temporary, it doesn't need a review. If it was permanent and done without review, I'd like to see a reference to this.
No, the transit improvements on Geary (and anywhere else in the city) are not slow in coming because of due diligence. The improvements have taken DECADES because NIMBYs stand in the way at every single opportunity. Same shit you see along Van Ness where perpetual scourge Peskin threw a hissy fit over the fucking street lamps. The Napoleon of North Beach ground the whole process to a halt over something so trivial that it could've been dealt with after or during construction. Improvements along Taraval got bogged down after the guy that owns Great Wall Hardware (Albert Chow) did his best to publicly sabotage any change. In that case the MTA had already determined that Tarval was particularly dangerous to pedestrians and transit riders but safety is apparently bad for his business.
Due diligence can be made more efficient but due diligence isn't usually the holdup.
Transit improvements to Geary won't come until the businesses in the Geary Boulevard Merchants Ass'n relent, that's not a government issue (unless you consider Bitchin' Baklava and Wayne Lee, DDS & Associates, etc, etc to be government).
We have the ability to do things quickly, but our government made it illegal unless there's an emergency.