+1 Don't really care about ugradeability/customisability, just make it great OOTB... So long as it's quite versatile,* & has excellent built-in functionality/utility/usability, that's enough. Then you'll have a solid device, that won't cost as much as a device that also focuses on ugradeability/customisability. But I know from an ODM's POV (i.e. you), the latter might be more appealing... *& hence mitigates the need for ugradeability/customisability