I disagree with this strongly. For some people the act of installing an OS is enough to fuck up their system. There is a reason to why most people do not install an OS on their devices.
While expecting people here to be able to install an OS on their own (especially with something like Web installer | Install | GrapheneOS), the general idea of selling/buying hardened devices is great and should not be discouraged.
Especially when we talk about people that aren’t techy, but still need to use a smartphone, laptop or any other device.