Until the battery needs replacing, costing more than a pi, one key on the keyboard dies, etc.
Do you need any of that? You can remove the battery and keep it plugged, and use it as a server to which you connect over SSH, with an added benefit of having local access if you actually need it.
Pi’s are ARM-based, which still to this day limits the scope of their applicability.
Also, you should absolutely inspect a laptop before buying. Many, if not most, of old laptops will run just fine for the next few years.
Untrue.
Until the battery needs replacing, costing more than a pi, one key on the keyboard dies, etc.
Which part?
Do you need any of that? You can remove the battery and keep it plugged, and use it as a server to which you connect over SSH, with an added benefit of having local access if you actually need it.