I recently refurbished a shower room. I got a nice digital pump shower which actually works very well. It has a button to turn it on and a dial to change the temperature. The shower has two heads, one overhead and one wall mounted. To switch, you hold down the button briefly.

So, thats all good, right? Actually, it's the most uselessly irritating thing ever. It always start on the wrong shower head and at the wrong temperature. So I turn it on and then have to wait for it to stabilise to the temperature I don't want before I can turn it up. Then to switch heads, I hold down the button. That works about every third time.

The other times it either ignores me or it turns the shower off. If it turns the shower off, I have to turn it on and then wait for it to reach the temperature I don't want again before I can turn it up and try again.

But no fear, it has an app. Oh yes, if I had an iPhone that was up to date enough. I could connect my shower to the internet, download and install an app, make an account and create a profile. Then I could use the phone to start the shower the way I want it. As long as the shower can access the internet, the phone has power and is on the internet.

To be clear I have to use the app to start the shower. If I were to create a profile and use it to set the shower and then next time, just press the button, it would go right back to the wrong settings. If I denied it access to the internet, right back to the wrong settings. If the company ever turns their server off, right back to the wrong settings.

Of course, the shower could just remember how it was setup last time and do that again, right? Just like the good old non-digital shower I used to have. Nope, its 'smart' so using it without data collection has to be a PITA. I even phoned the shower company's support people to see if there was anyway to set the shower properly, that was pointless. They just seemed to be confused that I didn't want to use their app.

I really should have known better than to trust digital anything.

https://www.wired.com/story/shimano-wireless-bicycle-shifter-jamming-replay-attacks/