How incredibly naive people posting here are. Do you imagine that Apple would lose something by turning out a Macbook with performance in the same bracket as the A14X (tablet) SoC? And, why wouldn't Apple do that? Are you aware that two Macbooks Air SKUs, i.e. the Core i5-1030NG7 and the Core i3-1000NG4, offer no more performance today than was already attained two years ago when using the A12X/Z SoC? Now, the performance of the A14X will be far superior to the A12X/Z and power consumption will probably be below the level of the mentioned Intel chips. It would make perfect sense to introduce fanless Mabooks powered by Apple silicon first. Fanless Macbooks with A14Xish performance would present a very compelling case when contrasted with Macbooks and Windows laptops with Intel's lacklustre low power processors inside.
The A14X, despite other comments here, would be an excellent starting point for a fanless laptop SoC. The only thing missing really is a sufficient complement of PCIe lanes for device connectivity but Apple might simply elect to add those to the SoC.