I'm referring to tablet/laptop hybrids with soldered storage like Surface Pro where storage options are only available at time of purchase and cost hundreds extra for an additional 128-512GB. By the time a high storage model pays off over cloud storage, your battery would probably be dead and you'd need a new device anyways.

If you have a device with upgradable storage slots, then you're probably a power user and presumably you wouldn't even store your data in the cloud (other than an extra backup)