During the hologram scene we learn that Tony is not only funding advanced technology to help soldiers with PTSD but that he's lavishing money left and right on all sorts of research projects, primarily to try to assuage his guilt over the damage caused by his decision to create Ultron.
Stark: Bi-neurally Augmented Retro-Framing or "BARF". God, I got to work on
that acronym. An extremely costly method, of hijacking the hippocampus
to clear... traumatic memories. It doesn't change the fact that they
never made it to the airport, or the things I did to avoid processing
my grief. Plus, 611 million dollars for my little therapeutic
experiment. No one in their right mind would ever have funded it.
The film opens with us finding out that Tony is trying to get back onto the side of the angels by sorting out his long-standing mental health problems, putting his "mad scientist" schtick to one side and becoming a better, less emotionally-stunted person by resolving his daddy issues.
Out of universe
The hologram sequence is a simple way to achieve a range of storytelling goals; re-establishing Tony's character, explaining his PTSD (Post-Avengers), guilt issues (Post-Age of Ultron) and long-standing intimacy problems, mostly stemming from his apocalyptically bad relationship with his father (Iron Man I, II, III), all of which goes toward explaining why he's so immediately willing to accept the Sokovia Accords, placing him in opposition to Captain America.
We also need to be reminded who Tony's father is, as a framing device to tying his life history into Bucky/The Winter Soldier's story.
Hologram technology also makes a (brief) return later, projected from Tony's
product placement Vivo phone