As a pilot "expect a late landing clearance" triggers several things in me:
- situational awareness. It tells me that for some reason - known or unknown - i will not get my landing clearance right away. Most of the time it is a developing situation. Traffic in front missed the first exit and trundles along on the runway.
- I will PREPARE FOR A GO-AROUND
This phrase implies a limiting factor for a landing clearance which is still there (see above.) So better be up and ready to take action.
- It also tells me that if it works out there is still a reasonable chance for a landing. My thumb is next to the TOGA button nevertheless.
- It also tells me at some airports and in some situations that I have not been forgotten.
IMHO something of a primer to heighten alertness without alarming. For me a very welcome thing as I now know that ATC has a plan and I have my finger ready at the TOGA button.