It has been a long time since I chartered from The Moorings. I believe they have a cookie-cutter process for ALL including "required" chart briefing. I believe most of the other smaller companies (TMM &CYOA) are able to more personalize the process. For a multi-time charter, it may be " More mooring boys installed here. This restaurant has closed for renovations. Fuel prices seem best here and here recently".
I doubt missing "required" briefing would change your liability... Run aground even in "non-redline" area is still your fault.