Unfortunately the Ahamkara don’t allow elaboration after the fact. Only the initial wish is taken into consideration, which is why Mara and her Techeuns had to invent a new means of communicating the Queen’s wishes through a combination of symbols to remove any wiggle room Riven may have had. Not to mention they can actively prey on your thoughts to grant wishes. Which is insane. No words needed.

Their wishes don't always have a twist, I mean, during the hunt, Saladin wish the ahemkara would turn into a dragon so he would be like the knights of old stories slaying a dragon. It D1 there was lore, which suggested warlocks often made wishes to gain more knowledge, and it never suggested any repercussions. Ahemkara seem to follow similar rules to genies. That can't wish for anything themselves, so they have to tack it on to others' wishes or use those wishes to set a chain of events in places which cause a desirable outcome to occur for them. Also as a side note, we could break the dreaming city curse by wishing for Rivens freedom, since she was taken by Oryx. So by wishes her to be freed from taken control, it would break the curse and time loop.

Do you know the process that goes into making a steak?

Depends on what you’re looking for with your fic. Want it close to the lore or just want to have fun? The latter, sure a clever enough delivery with a simple request could work. A good way is with your quote, as you didn’t say anything about the quality of the steak, you’d get a tasteless hunk of meat but otherwise no harm. However, closer to the lore, you’d likely get the whole cow. As you can’t get a cut of steak without harming the cow it comes from. And if you added a quality qualifier, you’d get the prize heifer of the cities biggest farm baron. Who’d accuse you of stealing and cause a commotion. Ahamkara read your mind, look into your deeper recesses where the truth lies and then try to twist it to their benefit. It’s never without some minor cost. I believe the wishing alone is enough. That’s why they don’t worry about dying. Like when Saladin asked the one to turn into a dragon so he could kill it. After death they have their hooks in their wisher-person. The lengths Mara had to go to get a fair deal with Riven is beyond what a solo Guardian can likely do. It’d take a lot of effort and expense and skills we don’t have. But like I said, depends on what you’re writing. Best thing about fanfic is having that creative freedom. You can have an otherwise serious and true fanfic go zany with a benign ahamkara section before getting back on the rails.

I don't think it always bad, given Savvy had had no repricusions for wishing for the Dreaming City curse. Also, I'm not sure that steak example could work. If you were given a steak, you could throw it at someone and cause harm. Anything can cause harm, so I don't think that phrasing would work.