ROW/ROP uses DRY and WET predictions based on maximum braking from an auto land with the WET considering maximum reverse thrust.
The system doesn't know the runway conditions. (e.g.. snow/contaminated/slush/standing water/ice).
ROW/ROP can be erroneous if the database (OANS) length is corrupted or shortened by NOTAM and actual LDA is longer than the database or if the airplane position is erroneous, if the IRS was drifting, or declared threshold was wrongly coded in the database hence displacing the the 3 deg path.
Maximum braking......