I know Obi-Wan Kenobi series wasn't exactly as important to many of us, as we knew where things would end up, that Kenobi and Leia would survive and that Reva won't do anything to hurt Luke permanently. Not that stakes are critical to a story, but it didn't seem to add the amount of value we expected from it (it was still good, some part give me chills).
But if one who has never seen Star Wars, and is free from major spoilers, were to watch the Skywalker saga in the chronological order of I, II, III, Obi-Wan Kenobi, (maybe Rogue One), IV, V, VI, then the whole outlook on it would change. Catching up with Luke and Leia when they're 10 and you don't know what is to happen must be quite something, and young Leia sets you up so well for what Leia is in the original trilogy that it's just incredible.
I kept thinking about this recently because I began Star Wars with Episode I in the theatres, and only saw IV, V, and VI after it because I was extremely impatient to see more Star Wars before the release of Episode II.
Had I not done that, and had not the old people in the cinema spoiled it by chattering “the kid becomes Vader when he grows up”, Episode III would have been even more shattering to me than it already was. Not everyone is so old to have seen the old ones, old man. I don't think even Lucas expected only return viewers to be coming back to it, or he would have made the foreshadowing that hinted at the shape of things to come in more obvious fashion. The only things the prequels truly spoil for the original trilogy is Luke's parentage (so one surprise reveal less), and looks of Yoda (thanks Baby Yoda for trending so much recently), and Leia's reveal (which was more or less awkward retcon). The other way round, it spoils everything.
Now a new viewer can even add Kenobi to the sage if they went that way, and casually reviewing what happened it it, it is quite something. I even think my lukewarm response to it when watching has been entirely due to being “spoiled”, for the lack of better word. I even dug a bit on Youtube to find if anyone has watched them that way, and although this is something very hard to look for, it would seem the series worked as I expected it would.