Yes this is the Duggars, and being the media whoring insensitive people they have been known to be, any behavior can be interpreted to support that even if it wouldn’t be odd in another family.
In our family yes people take photos of the floral arrangements, guest book, casket, service, grave site, but mostly of relatives together at the repass or the grave site. And this was the norm when I was little so it’s not about social media or camera phones. It’s just what was done. I don’t recall anyone ever being upset by it.