Well, SW cannot write dialogue to save her life, so I think some of the issue of it not ringing true is simply that.
I know what you mean about the LL speeches, but for me they’re no more unbelievable than the ‘Ugh, HOMELESS!’ or ‘Ooh, Mr Armitage, we won’t tell a soul you’re undercover!’ exchanges of TSP, or the frankly incredible discussion about homelessness, rough sleeping and reintegrating into society she and TW supposedly have with a group of homeless men in Truro in TWS. Or Bill Cole weeping with gratitude on his first visit to the cider farm after the Walkers start their healing magic. Or the Big Issue seller who has magically kept a back copy because SW’s article inspired him with its majesty.
I think that with any dialogue written by SW, don’t think ‘Did this actually happen?’ because the answer would seem to virtually always be ‘No, of course not, don’t be silly!’
Think ‘What effect is she going for here?’ How does she want this encounter to makes you feel about our heroes?
I think what you’re noticing on the walk in LL is that she doesn’t know what effect she’s going for in encounters with other walkers.
It can’t be ‘Ugh, you’re HOMELESS?’ or ‘Ooh, Mr Armitage!’ and it can’t be ‘Aren’t you lucky to be able to take all this time off?’ or ‘Nice kit!’ because she clearly doesn’t want to give the impression that the Walkers are what they in fact now are — well-off retirees doing a LD walk for leisure, via GPS, hotels, car collection services, buying new kit online at will etc. It obviously can’t be them staring enviously at other walkers eating large restaurant meals, because they’re almost certainly richer than most other walkers.
Hence people they meet in LL speechify a lot about nature, because she can’t ‘cast’ them as callous homeowners othering the homeless, greedy pigs tucking into big plates of food, jobsworths trying to make them pay for campsites, ferries etc. She can’t give them anything to say about the Walkers.
She’ll still leap at any opportunity to make the Walkers look like victims (the cafe that won’t serve them indoors because they’re not local, SW’s bloody boots), but as this is clearly a walk done to give SW another book, while it’s supposedly done to snatch a deteriorating TW from the jaws of death, she has to up the jeopardy by making Dave and Julie shocked (as in TWS) by TW’s deterioration and gravely concerned about his ability to do the Cape Wrath trail.