TrickyTony said:I have asked before, and seen it asked by others but I still have not got an answer. Can someone please explain the need/value of switching IOS with wad manager. I'm sure there is one I just "don't get it."
If you have IOS249, there is no need.
But if IOS249 gets corrupted or deleted, it can be very useful.
You can change the IOS to IOS250 (backup of IOS249) or some other IOS with the trucha bug so you can install wads again.
EDIT:
phpgeek explained it better














