I don't really have a problem with their conditions. A, B, C and F seem quite straight forward
D = Rolex watches can have a higher value when unmolested, so if a service changes the hands or dial for example it might be worth less after the service, I think that's where they are coming from on this one.
E = is just a catchall just in case someone evaluating the watch misses something, unlikely to happen I know but lawyers tend to consider every possibility no matter how unlikely. Another possibility is that a watch is altered with non-original parts after a Rolex service and sold as original with service records.
My personal experience of Rolex UK has been first rate to date - except having to take a gulp at service prices
My Sea Dweller, RG's Lady Yachtmaster and a Tudor are due to go in so I hope the good service continues