well switching in and out is not intended to provide you the same options of the difficulty... you still get a choice and pick mythic option 1 or 2 even if you miss 33% of the raid. Just the 3rd alternative in that row is locked which again is intentional if you are swapped or are unable to kill all of them in that difficulty.
In those cases with raid comps switching... most will have a m+ 226 alternative unlocked as well...
So yes.. it is not the same amount of options if you do comp switching. but that is entirely intentional and not unfair.