It's a different dynamic but not a worse one.
I've got 5 years from dc1 to dc3 and they don't play together the way close in age siblings do, but they adore one another and never, ever bicker or squabble the way closer in age children do. The age gap is so big that the relationship is asymmetric, meaning dc1 would no more squabble with dc3 than a parent would with a child - peers on the same level squabble, with a bigger gap the older one wouldn't humiliate themselves by bickering with a baby/ little kid and isn't embroiled in battles of wills with them.
Dc1 plays with dc3 but more the way a babysitter plays with a child in their care, not the way close in age children play. The dynamic is different but not worse - after all children have their own same age friends given school is so rigidly divided into age bands.
My dc1 and dc2 have a very different, both closer and more difficult relationship because they are barely 2 years apart and were genuinely peers, best friends, did everything together from about age 2 and 4 until age 9 and 11, but then dc1 pulled away/ ahead (dc1 is a girl and dc2 a boy which as puberty hit dc1 widened the gap because male puberty is later anyway, so she became far more teen/ grown up while he remained behind every bit a child). Now dc1 and dc2 do bicker. A small age gap can be a bit too close for comfort sometimes and more picky/ snappy, as well as having a unique bond.
Dc2 now plays with dc3 as an equal (dc3 was like an only/ indulged puppy in the older 2s eyes until he was about 6) who is 3 years younger than him because dc2 and 3 are now more on the same wavelength.