The system works very well at LGW and is a high value safety factor at that airport. It not only provides for ease of use, but in effect provides a secondary set of instructions where any discrepancies can be highlighted ( excuse the pun) and questioned. The system shows the intended initial routes off the runway exits thereby assisiting in reduced blockages during periods of high R/T useage.
The system is clear and easy to follow compared with the often confusing mess at Manchester where such a system is not employed.
Don't get rid of it !