Another one; since we have no idea how long it took to get to Bespin or how long Luke trained on Dagobah (days, weeks, months?) Shouldn't Luke have told somebody where he was going? Depending on how long he was there, don't you figure the whole rest of the fleet must've just assumed he got killed leaving Hoth? I can just imagine General Reikan or Mothma or somebody just scolding the crap out of him when he finally returned to the fleet "Where the hell have you been?!! Do you know what time it is?!! We have been worried sick about you!!! You can't think to give us a call or anything?!! For all we knew you could've been laying dead in a ditch!!"
In the supremely awkward deleted scene where Luke and Leia had actual kissy-kissy instead of "Leia's trolling Han kissy-kissy," Luke told her he needed to leave for a while; I suppose if this scene had been used, while it's definitely not a formal or even good enough request for leave through the proper channels, because of her high rank he might have figured he could get away with that, as she would have been able to tell anyone asking after him once the fleet regrouped (though he hadn't told her
where). But since this was cut out, nothing else was inserted to cover Luke's butt on this.
On the one hand, yeah, he had his spiritual instructions inconveniently given to him while he was dying of hypothermia and thus anyone could tell him he was nuts and just hallucinated nonsense out in the snow, so he might have been embarrassed to mention that. On the other...he could've just straight up fibbed and fudged that, since apparently the Alliance put a lot of stock in Jedi - they used "May the Force be with you" as a universal benediction, after all - and if he'd just been selectively honest, there's a chance they'd have simply let him go.
But that was a gamble. His superiors might
not have let him go because of his responsibility as Rogue Leader, and this is something Luke obviously felt very, very strongly about, so it's possible he felt it worthwhile to risk his rank and incurring charges of going AWOL against him to go "
Luke be a Jedi toniiiiiiiiiiiiiiiight." Even if that was his rationale, though, it wouldn't have killed him to at least tell a buddy like Wedge on the downlow. The pilots still on the ground when we see Luke heading out post-Battle of Hoth look strangely chill for an evacuation, lol.
Honestly, this could have been one of the reasons why there's a 6-month-to-maybe-year-long gap between ESB and ROTJ - not only would Luke have needed an adjustment period with his prosthetic hand and likely spend some time continuing self-training, but he could have had his ass raked across the coals for desertion and maybe got stuck on probation. Sure, he got a little leveled up in the Force, but him turning up beaten to hamburger by Vader and losing a hand and not really doing anything else productive while ghosting on the Alliance should have definitely gotten him an earful, even if he's Luke Kriffing Skywalker.
Buuuuuuut, this isn't a problem in the films or even brought up because it's beside the point and Lucas obviously wasn't hung up on making it an issue, lol. COMMENCE HANDWAVING.