I have been playing Destiny since the D1 beta. I stopped for a while soon after the launch of D2, and then my friend got me back into it a month or so ago (I was able to play through Forsaken up through Beyond Light). But, since I started playing again on Steam and had only played on Playstation up to that point, I don't get any of the veteran dialogue associated with D1. This is not a big deal by any stretch, I'm just curious if that would change at all if I activated cross save between my steam and PS accounts.
If your PlayStation progress is entirely separate from your Steam progress, then you cannot have veteran dialogue unless you choose to cross save your PlayStation characters to Steam instead. Bungie does not provide the service to merge accounts or progress.