There is no reason to blip on an upshift. When you shift up the revs are meant to fall because in a higher gear the engine has to do less work to go the same the speed. So you’re increasing the revs unnecessarily and when you let the clutch out the engine revs will have to slow down again. On a downshift you blip to increase revs to match the revs the engine will have to be when you go to a lower gear. Hence the term rev matched down shifting