Portugal is lovely, but I don't see why Harry and Meghan would want a home there.
It's true that some celebrities have moved there as they offer a very generous tax regime for wealthy residents. But you'd have to be just that - resident. Simply spending a few weeks a year there won't cut it. People in Northern Europe might like a holiday home in Portugal for sea and sun, but the Sussexes already have that in Montecito, so why buy a house in a country on a different continent with few direct flights?
I agree that the lack of a holiday home probably does rankle with them. Their neighbours in Montecito likely have several. But not them!