Why? It’s the safe way to do it.
Why? It’s the professional way to do it. Many people read and use the page numbers – a lot.
Why? Long crystal tracks may prevent the crystal from oscillating – so, crystal may not work.
Why? Find your files quickly, find your colleagues files quickly, backup the important files, know what files were used for manufacturing
TIP #044: When doing placement under BGA, first only check where the free space is and then do it again
Why? When placing the components – second time, you will know which direction you have some free space.
Why? You see directly and clearly from your schematic how the pins can be used.
Why? Very often this is used during board assembly and it is very useful during debugging.
Why? Helps during assembly. Can prevent placement issues during PCB design (e.g. too close, wrong rotation,…)