It seems to take some roads months to "recover" from surface dressing
But look on the bright side, it is proper resurfacing and once the layer of gravelly bits have washed away/ been swept away by traffic the road will be more consistent and generally better
I hate top dressing, and I wouldn't call it "proper resurfacing", not by any stretch of the imagination. Proper resurfacing involves grinding off the top two layers of asphalt on a whole section of road and then laying and rolling out a new surface. Top dressing is merely spraying molten bitumen on the road surface and spreading a layer of chippings over the top. The speed limit imposed for a day or two after the chippings are spread is routinely ignored, which rips loads of chippings out of the fresh bitumen, to add to the loose chippings that didn't adhere in the first place. And off course, the contractors are relying on the traffic to "sweep" the loose stuff away, so it piles up in the centre of the road, between the wheel tracks and in the gutter, making life interesting when you try taking the racing line through some corners on a road that has been treated thusly.
Top dressing is the "go-to" method of resurfacing because it is quicker and cheaper than grinding off the top layers of old asphalt and putting down a new layer. The way the average Highways department is funded, the surface on any given road has to last well beyond it's design life, which is why most country roads in this country are becoming about as rough as a typical bridleway.
Did I mention that I don't like top dressing?
From a cycling point of view, it blows goats, especially if a larger size of granite chipping has been used, which makes for a particularly "draggy" road surface.
Then again, don't you ride a Roubaix? Most of the "road buzz" gets dampened out by the frame...