Probably has plenty more power than this laptop: https://browser.geekbench.com/v5/cpu/7185745
As far as most consumers are concerned, even Exynos chips may be worth it for desktop use because they can use the extensive video acceleration support that mobile GPUs have which many desktop chips still lack.
Sadly, the Windows world is far from ARM-compatible. Few people install applications through the Windows Store, and bringing Linux to the masses with an alternative, low-power laptop processor will probably end up failing as well. I fear that the lack of software support will prevent Samsung for replicating Apple's success.
Maybe Samsung can stuff these chips into Chromebooks, those provide a limited yet cross-platform operating system that some markets are getting used to already. There are plenty of ARM Chromebooks out there, so I'm not sure how well Samsung could compete in that space.
My guess is that they needed the engineers for AMD GPU integration and ARM happened to have a good design at that time so the choice was simple.