You have to. I don’t know if episode 4 can be saved. It’s bad bad. No underwater security? Darth Vader now speed walks? Snow speeders just hover oddly? vader doesn’t kill failures? Obiwan thinks a trench coat for a disguise will work? I literally cannot think of one salvageable moment? What if Obiwan let the water come in and they will escaped through the water?
Either way it would be convinient and/or bad writing. How so? Obi-Wan doesn´t have the opportunity to look for a better disguise (per your argument) because the writers deem it to be that way. So your rhetorical questions running nowhere.