What is the purpose of the T-568 ethernet color code standard
In comments you clarified,


  what i meant was why did the TIA standard not make the standard make it in a sequence in the first place, since most of the time they are in a twisted pair and beside each other.


This keeps the pin assignments compatible with the telephone modular connector that it's derived from.

With this arrangement, a cable can be repurposed from voice use to data without re-terminating it. The blue pair can even be used for voice while the orange and green pairs are used for 10 or 100 Mbps Ethernet in the same cable.