A device can be in perfect working order and still be unusable for its intended purpose because updates have stopped. Support windows, not hardware failure, increasingly decide how long a product lasts.
Support costs continue after the sale
Maintaining software for a device means testing every update against that hardware, and the work grows with each additional model still being supported.
Revenue from a product arrives once, while the cost of supporting it continues for as long as the commitment lasts.
Manufacturers therefore set an end date, and the length of that window is a business decision rather than a technical limit.
Security is what makes the end date matter
An unsupported device stops receiving fixes for newly discovered vulnerabilities, and those vulnerabilities accumulate over time.
For anything holding personal data or connected to a home network, that changes the device from old to genuinely risky.
The functional experience is unchanged on the day support ends, which is why the significance of the date is easy to miss.
Services withdraw before the hardware fails
Applications set minimum operating system versions, and once a device cannot update it gradually loses access to banking apps, streaming services and messaging.
Connected products depending on a manufacturer's servers face a sharper version, since the product stops working entirely if the service is shut down.
Smart home hardware, wearables and connected appliances all carry this risk, and it is rarely disclosed at the point of sale.
Support length varies enormously by category
Some manufacturers publish support periods for their devices, and the difference between the longest and shortest commitments in the same category is substantial.
Budget hardware typically carries the shortest windows, which means a cheaper device can have a higher cost per year of use than an expensive one.
Regulators in some regions have begun requiring minimum support periods and clearer disclosure, with requirements that vary by jurisdiction and continue to develop.
How to read the window before buying
The useful figure is the end date rather than the number of years, since a device bought late in its production run has already consumed part of its window.
Where a manufacturer publishes no policy, the history of its previous models is the best available guide.
For connected devices, whether the product still functions without the manufacturer's service is the question that determines what happens when support ends.