I have never seen a tree drop an acorn with a core aerator attached to it. Throw seed on the ground and roughly 90 percent of it finds somewhere to grow. I cannot run a business on 90 percent, though, and the missing 10 percent is never scattered at random. It is the strip under heavy leaf drop, the shaded run along a fence line, and the ground where common Bermuda grass, Cynodon dactylon, has matted over the surface, which on a full sun Culleoka lot usually means the drive edges and anywhere the soil runs hot and shallow. On open turf, aeration improves establishment a modest 10 to 15 percent over broadcasting alone. Where a Bermuda mat is intercepting seed, in my experience the improvement runs closer to 75 or 90 percent, because the holes put seed into soil it could never reach from the surface.
I run parallel passes and then a second set at 45 degrees rather than 90, which lays down a diamond and gives more holes per square foot than a cross pattern does. Seed drops through a metered seeder built into the aerator, straight into the open holes, instead of being flung by a spinner into the beds and out onto the gravel.
On compaction, here is the accurate version instead of the sales version. Core aeration does relieve compaction, and it is essentially the only method that does it without tearing the lawn out. It is not permanent, because the holes close within weeks, and it takes real core density to work: K-State puts effective cultivation at 15 to 30 cores per square foot, and a single commercial pass delivers about half of that. Genuine compaction is also rarer than the industry lets on, since freeze thaw cycles and root channels work against it year round. The lawns that truly have it are the ones people keep re-compacting, like the backyard that hosts everything or the patch where a kid practices every evening. Those earn a second aeration in spring, which is what the standalone core and liquid aeration service is for. In fall, aeration pays for itself through what it does for the seed. Everything I put down is guaranteed to germinate within 30 days, and if an area does not come in, I re-aerate and reseed it at no charge.