TCAS fail, note that the factors quoted are for jets, turbo props differ.
Your interpretation is generally correct except that in-flight re-planning could be interpreted as requiring the same aspects at the destination.
EU-OPS 1.400 requires the Captain to satisfy himself
… that the condition of the runway intended to be used should not prevent a safe approach, landing … in the pre-landing assessment. From a safety perspective (consider how regulators define and use safety), it might be difficult to justify landing with any lesser factor than required for dispatch. The dispatch calculations are ‘safe’, thus, any lower factor might be construed as less safe.
Normally the industry requires the highest level of safety, except where different levels can be justified by risk assessment such as in an emergency.
An interpretation or guidance might be in
UK AIC 14/06.
Also see
AIC 86/07. and
http://www.skybrary.aero/bookshelf/books/874.ppt