@Bouquins If you don't use high graphical games or if you don't encode video or such things (or experience problems decoding some very high resolution videos), you probably don't need to install the nvidia proprietary drivers, as you noticed is makes the PC warmer and drain more power which is something you won't like if you use your laptop on battery.
Personally, on an optimus laptop, if you don't need the nvidia GPU, it's better to use the intel GPU, which consume less power and are usually very well supported on linux (nouveau is a reversed engineered driver for nvidia which isn't very efficient due to nvidia not communicating needed technical details to the nouveau developers).
If you don't want to use bbswitch, an alternative is to remove the nvidia GPU and blacklist nouveau (or add the kernel parameter nouveau.modeset=0). This way you'll run on the iGPU and you can easily install the nvidia driver if/when you want to use the dGPU for better performances.
