I think RW has to omit anything that makes the walk look like a planned holiday, or them going back to a way of travelling on the cheap that they seem to have done a lot before they had children, or as though they had other options other than walking.
Or as if the walk was for the purposes of writing a book.
One of the oddities of the two sequels is that there’s no reference to note taking at all, either, even though these were very obviously walks undertaken because RW had a book contract and a readership.
Whereas, say, Simon Armitage, also walking two LD paths for two books, is completely upfront about recording voice notes during the days (and the awkwardness of trying to find places to step away from any walking companions to do it) and that he spends hours every night writing up longer accounts. Because these are walks done at least in part, for the sake of being written about.
Whereas RW sticks to the initial TSP line that all the walks she and Moth do are desperate attempts to forestall his decline, not in order to produce a book by a deadline.