Yes and no.
If I feel I have gotten the complete experience or at least an experience that gives me a good idea of how the game plays or how the story goes, then sure.
It’s basically the equivalent of watching a movie on tv, but never all in one sitting. Or watching enough of a fairly average or even good television series, but not every single episode.
Like, have I played all of Castlevania: Symphony of the Night? No, I actually kind of hated my time playing it and never even got close to the second castle. But would I consider that I have “completed” it, I have watched dozens if not hundreds of speedruns of it across several categories and have played it’s successors to death? Yes, absolutely. There is nothing the game has to offer me, even if I haven’t fought half the bosses or ever done an Air Slash myself.
Yet there are still some games that I have watched way too much of, but still felt I had to beat on my own. Rogue Legacy was one of those games that I remember watching several different streamers and let’s players go through, yet still felt that I needed to beat it myself to have actually “experienced” it.
And it’s not just roguelikes. I may know the ins and outs of most of Breath of the Wild at this point, but until I’ve actually mapped that whole place out and killed Ganon myself, it’s still on my backlog list.