Danny, I gotta wonder what era of Marvel Comics had this immaculate consistency and commitment to internal logic that you seem to be expecting from the movie.
None. Both Marvel & DC have done all kinds of things with characters' histories, powers, and so forth every few years- sometimes they'd even differ between to concurrently produced titles.
And when that happened, I'd gripe about it with my fellow readers if it were a bad change, and praise the writers if it were good.
For example, Superman had a 40 year history of power creep up until John Byrne took over (right about the time of the first modern Superman movie)- the more powerful the character got, the worse the storylines got. With Superman becoming a virtual god among mortals, the writers had to jump through flaming hoops to justify Supes' being in danger of being defeated...more magic, more previously unknown vulnerabilities, and more power creep in his adversaries. Byrne's team radically toned down the character's power. No longer was he able to move planets at will, or fly through the core of stars without feeling pain. This was a good thing.
OTOH, while the writers of the C. Reeves movies did generally follow Byrne's lead, they still had him using gadgets never before seen (middling OK, if goofy), and still had him turn back time to save Lois (bad, very bad).
And, for the record, I'd do the same thing for any kind of entertainment. When M.A.S.H. or Star Trek Next Generation would introduce a new concept (Hawkeye & Trapper's horse, gone without a trace before Col. Potter ever showed; Crusher & LaForge's on-the-fly kludges that saved the ship this week, never to be used again, regardless of usefulness) and subsequently drop it as if it had never existed, I'd gripe about that too.
Remember when Trills couldn't use teleporters...and then they could? Yep- I complained.
Again- I'm not going to let some writers tell me something is good if it clearly isn't. If I think they (or someone else, for that matter) can do the job better, I'll let them know, if by no other way than by spending my $$$ on something else. If writing is unacceptably bad, regardless of the genre, I won't accept it.
You think you can just say "well, if their powers switched this one time, the surfer would be doing it all the time". That's pretty much a load of nonsense.
No, it isn't nonsense- its a logical response to witnessing the results of the power switch. If the power-switching were something reproduceable, he'd do it every time as a purposeful- probably opening- tactic. It's simply too useful not to do.
The power switch is the exact sort of quirky happenstance that occurred in silver age comics.
And in other eras as well. That doesn't make it good writing any more than Brainiac's pink hot pants was an example of good art.