It’s also worth noting Kate Middleton did speak warmly about Meghan Markle when she was going through her first pregnancy, around the time that feud rumors were first swirling heavily.
Even if Meghan Markle chooses not to expose any issues or rifts between the two couples, that doesn’t necessarily mean the “distant politeness” comparison is inaccurate.
It may just mean that the two families are a subject Markle isn’t really interested in touching publicly.
In fact, the term “distant politeness” was used in the book to describe their relationship.