Oh god yeah.
The most obvious one is the lack of relationship with my family - I find it really generous when my mum gets him a single Christmas present, as she barely knows him.
We go on holiday without him - though this one is somewhat circumstantial as we've only ever gone on one holiday that wasn't paid for/with my family, and that was only possible because we made use of term time prices we couldn't do with him.
I call him my DSC (on here) even though me and DP aren't married yet, as it's a LTR with two kids and it's just easier.
My DP does not deliberately carve out 1:1 time with him - we just all muck in together and if something he's doing happens to only be of interest to DSS they might get some time alone, but it's never an organised thing and never takes up a whole day. We don't have that much disposable income and don't get out that much, we're normally just knocking about the house, so if we were going out and paying for an activity it wouldn't really feel natural to just take him. 1:1 time was not a thing when I was a kid and doesn't really feel important to me.
This is kind of just a psychological one to do with how people are expected to think on here, but we don't really see ourselves as a "family unit" that is incomplete without DSS, or a "family of five" etc etc etc. We are very much a unit without him and he feels like a visitor added on, really. I consider this the natural outcome of only visiting EOW. We certainly don't turn down invites that don't include him while he isn't there, for instance, it would not occur to either me or DP to react like that, it's just a very natural part of our lives.