Yeah speaking as someone who uses the hell out of it, it's super useful and should probably be banned outright.
The logistics of banning it are pretty hard though. Even if you ban the loadout switcher, it won't be very hard to write another script that switches to and from another class very quickly. The only solution I can think of is map changes; setting the actual spawn area far back enough from the door that the door has to close before you can change classes, like in the newest granary pro.
messiahalso not to mention medics can backspawn with whatever amount of ubercharge... SOMETIMES 100% and have a get out of jail free card. (this case doesn't happen too often i would say happens a lot more in pugs than in league matches but still)
T̶o̶ ̶b̶e̶ ̶f̶a̶i̶r̶ ̶t̶h̶i̶s̶ ̶i̶s̶ ̶i̶l̶l̶e̶g̶a̶l̶ ̶i̶n̶ ̶E̶S̶E̶A̶ ̶(̶a̶n̶d̶ ̶I̶ ̶t̶h̶i̶n̶k̶ ̶e̶v̶e̶r̶y̶ ̶o̶t̶h̶e̶r̶ ̶l̶e̶a̶g̶u̶e̶ ̶t̶o̶o̶?̶)̶ ̶a̶n̶d̶ ̶i̶f̶ ̶y̶o̶u̶ ̶c̶a̶n̶ ̶p̶r̶o̶v̶e̶ ̶t̶h̶e̶ ̶o̶t̶h̶e̶r̶ ̶t̶e̶a̶m̶ ̶d̶i̶d̶ ̶t̶h̶i̶s̶ ̶y̶o̶u̶ ̶w̶i̶l̶l̶ ̶g̶e̶t̶ ̶t̶h̶e̶ ̶w̶i̶n̶.̶