I'm an experienced cook, so (again, with the exception of the immersion circulator) I'm not in the target market for these devices. I'm having trouble understanding the target market though. I was thinking that it was for inexperienced people who want to cook at home. When I play that scenario through my head, it doesn't completely work.
Take your salmon example: getting the pan to a good temperature and cooking the fish to the ideal temperature is not easy, so I can see how an inexperienced person could easily benefit from real-time temperature feedback. What I'm having trouble figuring out though, is that after gaining experience from cooking fish a few times, what's the benefit of the real-time temperature feedback? I guess the thing I'm wrestling with is that as one becomes more experienced, the value of these smart devices seems to rapidly diminish.
I don't intend this to be negative or harsh, so I hope it doesn't come across that way. I'm genuinely interested in the thinking behind this smart device trend. Hope you can share.