(epistemic status: I believe "hypnosis" does have a certain specific and heavily caveated role and I'm purposely ignoring loopholes and further arguments for sake of main point, but I think these arguments are worth addressing and have real implications)
Hypnotic techniques are incredibly useful, but "hypnotists" don't have a unique claim on them. Take anyone that is skilled at persuading people to feel differently and it'll end up looking like "conversational hypnosis" because it's all the same stuff.
What hypnotists do different is 1) having a model of what they're doing, and 2) having a frame that explicitly allows for "magical" change and can enhance expectation. The question I want to look at is "Why should we ever need that frame?"
Okay, yes, it's obviously helpful. When someone buys into "hypnosis" they can set aside all sort of blocks which allows you to get some work done that would otherwise be difficult, and this can be an empirically validated good thing.
But it makes me wonder - why is it needed? If someone decided on their own "I'd like to be hypnotized to not be afraid of flying", for example, that shows that 1) they think it is both possible and safe for them to not be afraid of flying, but also that 2) they don't feel like they can "just do it". If they already know that its possible/safe, why can't they just do it?
The answer to this question depends on the case. Sometimes it's "part of me thinks it is dangerous!" - but in those cases should we not address that part to make sure we're doing the right thing? Isn't it a mistake to write the bottom line first and ask to be hypnotized to be unafraid? Once that part is addressed the fear (or desire to fly) is not a problem anymore, so what use is hypnosis?
Or maybe there isn't even a part of them that thinks flying is dangerous, but they're convinced that they can't "just" drop fears like that. This is the same problem on the meta level (instead of looking at "to fear X or not to fear X?" we're looking at "to be able to drop fears or not to be able to drop fears in general?"), and the same concerns apply. If they don't feel like they can "just do it", then what's stopping them? If it were simply that they've never considered the possibility, you wouldn't need hypnosis, you could just tell them.
Given that any "hypnotic phenomenon" - whether name amnesia or removal of fears - is accessible without hypnosis, and that the blocks to doing it without hypnosis are for reasons - and that known bad reasons can simply be dropped - when is asking to be hypnotized for a known outcome not the mistake of writing the bottom line first?