Interesting interpretation @LimeNotLemon
I would imagine
QE/Phillip loved their grandson dearly - because of grandparents do. We don't really know then well enough to know if he were a favorite or just one of the many beloved grand kids they had.
QE/Phillip made efforts to welcome and warm to Meghan because they loved Harry. But in reality, how much opportunity did they have to personally get to know her and form any real connection. How much time did Harry and Meghan actually spend eating Sunday roasts, playing games and getting to know Harrys Grand Parents. Given the very busy schedules of both sets of working royals, and younger ones jet setting social lifestyle split across two continents.
QE/Phillip have been there, done that and seen it all before, watched many royal brides built up and pulled down by the papers and followed the same methods laid out by their experienced PR teams. Personally, I would imagine an elderly couple (born on a pedestal who have never had much occasion to learn to be patient with other opinions, who lived through a war where the national resolve was to not complain but get on with it) would probably get quite irritated and rather impatient with the 'young ones' deciding to shake it up, do things their own way and not follow the tried and tested advice given.
Just my opinion, but I would say they loved Harry, they tried to love Meghan and probably did like her to start, but didn't get to know her well enough to form a real bond before everything blew up and at the time of their deaths were just tired of the whole sorry situation.