In these days it is not enough to make a smaller chip to save $5 on the BOM of a $600 smartphone, but it should deliver more performance and battery life to better suit the more demanding apps.
Historically, the compute industry has always added more performance by adding transistors. Hard to do that if the transistors don't shrink, unless you're willing to raise costs.
And it's more than a BOM issue if you are silicon providers, like Qualcomm, nVidia, or TI. You'll get paid the same $20 for your silicon, even if the cost goes up from $10 to $15. Or $20.
Apple or Samsung may not care though. To the verticle providers making their own silicon, it's just BOM.
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