There he has a point, following some process in Terminal is much easier in some cases!
More like
sudo apt update && sudo apt install libreoffice putty inkscape gimp
I 
single user OSs!
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You have to move one hand away from the keyboard to reach the mouse, then move the mouse pointer it to the right position, then click the right mouse button - and then you have to move your hand back to the keyboard to type. This is always way slower than just using the keyboard. It is more pronounced in programming sessions - but I’m sure you already know that better than me.
It’s vice versa actually. Visual perception is very fast (indeed, otherwise people would be unable to play Quake) while typing requires a bit of planning which is slow.
Physical movement is not a bottleneck, thinking is almost always slower.
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Try explaining where to click (the round thingie left of the blue feather …)