Why buy a used phone that will stop receiving updates, can't be fixed or upgraded and can't run whatever you want on it when you can use a real computer instead?
Who in their right mind would put Windows on such a device, though? This is THE hardware generation that Microsoft painted a target on with their planned obsolescence strategy. I don't know if there can be a clearer signalling that it is to be avoided at all costs.
As for "can't be fixed or upgraded", ask any macOS user.