LCD 16x2, what can read mode be used for?

Question

Arduino

The LCD on the HD44780 has an R/W pin that is used to switch the mode (read/write). In all the examples I have seen, it is always shorted to ground.

Answer 1

Reading is a very cool way to reliably know that the display has eaten data and you can send the next byte.
This allows you to update the picture very quickly, because you do not need to wait for a delay.

Answer 2

When writing data, I switch this pin to send data to the display. Without this, part of the data was lost.