Why ethernet RJ45 8P8C are wired in today's way?

Can't understand why RJ45 connector need to split pair-3 and put pair-1 in-between them?

Could anyone help explain the reason behind it?

Maybe it helps ...

"When the 8P8C connector was introduced, the pin-pair assignment maintained Pair 1 on the two middle Pins 4 and 5, and Pair 3 was split around Pair 1 onto Pins 3 and 6. The reason for the split pair was to maximize the mechanical compatibility of the connector with existing one-pair analog telephones. Required by FCC specifications, this wiring scheme made sense at the time but has since been the source of challenge. With one pair split around another, the coupling from Pins 4 and 5 onto 3 and 6 introduces the most crosstalk within the interface."

quoted from there: http://hyperlinesystems.com/info/cabling_02-09_14/