I agree the whole episode has a different feel about it. Probably because it involves a lot of reflection. You get the sense of looking back at ghosts. Yet there is a crazy humor in it as well with the Warship Voyager recreations. Not so funny really for The Doctor wanting to protect his friends, being separated from them and not even actually being missed because the running Doctor just carried on.
The Doctor being a hologram had that 'belonging' and 'not belonging' duality. Like in Timeless, he could be reactivated when everyone had perished, and Blink of an Eye, he could be unaffected by time. Even Endgame you know he would live past his friends. In Living Witness, he came through. Brought peace to the factions and saved Voyager's reputation. Yet I get how he wanted to move on even after years with the Kyrians and Vaskans. He had become an explorer and still had that end goal to get home to strive for. I liked how it was a one episode story too, it did what it had to without messing with the momentum.