Mobile chat applications seem to all follow a similar pattern - chat bubbles on alternating sides with colour differentiation between you and the person you are talking to. Examples of this: google hangouts, facebook messenger, skype.
However their desktop counter parts follow patterns closer to that of email. no speech bubbles, no alternating sides, everything left aligned, etc. (and for facebook i am referring to the main mail page not the chat widget)
Can anyone shed any light on why this might be the case? what are the ux benefits of keeping the traditional plain text left to right format when on desktop?
(a related aside for anyone who is interested: Chat arrangement question: Left or right?)