If the holodeck can create a representation of anyone, such as the episode where Geordie can create Leah Brahms with I believe only a 13% error, how would this change the way people experience loss?
There was that episode The Bonding where an alien pretends to be the kid's recently dead mom. The crew helps him let go of that alien. But the show doesn't deal with the fact he could have popped into the holodeck the next day and had another fake mom.
Welsey could have spent time with a holodeck version of his dad. Anyone who gets dumped in a relationship could create a virtual version of that other person and continue on in the relationship. You could even pay a doctor to remove the memory of losing them in the first place.
How do you think they stop people from doing that in the trek universe?
Roddenberry had the idea that in 300 years, people in general grieve differently than today because of humanity's different self-conception of their existence. I always liked that idea.