[zshift]

The only issues I’ve run into with older laptops are limited wifi speed/range, the inability to decode HD video streams efficiently, and battery life, which is mostly solved by a new battery, though efficiency isn’t always great with older devices.

[GhettoComputers]

The heat is terrible too. You had no heat issues? All the laptops I had will cook you alive if you tried using them on your lap.

[LargoLasskhyfv]

That is because laptop is a misnomer. While technically possible, most of them have some sort of vents for either air intake or outlet there. Which is then blocked. And makes it cook. Even if they vent backwards/sideways only, they still cook because the little free space between bottom and table(or whatever surface) is still blocked.