Imagine you've been asked to contribute to a draft FCOM...
.... so do you slavishly follow the RFM or use the 49 years of aviation experience to influence a more cautious approach? There does appear to be an assumption on the part of manufacturers that their carefully designed and lovingly built machines arrive in perfect shape on day one and stay that way. It's been my experience that every helicopter ever built assumes a different persona the day a maintenance worker lays his hand on it.
We have seen many times that assertions that certain failure modes are protected against because they comply with the necessary certification requirements. These assertions are occasionally blown apart by actual events - good old Murphy's Law, aggravated by Sod's Law and compounded by 'The Jammy Side Down Syndrome' (if you trust to luck don't be surprised if you are disappointed!).
So, go with and by 'The Book' - or use actual real world experience to influence your contribution to this vital FCOM document. It will invariably be more cautious than the RFM but under the heading of 'guidance' there may be scope for some words of wisdom.
G.