The demod used case is a silly one that makes zero sense, but instead of asking why, think, what else is possible.
For most peoeple the act of brushing their teeth marks waking up or going to bed.
With such data exposed and combined with timing data you could trigger morning or night time routines. For example, the toothbrush transitioning from running -> idle after 8pm and before 4am could cause the bedroom to go into sleep lighting (gold at 40% fading out over 15 minutes), all other lights to be turned off, all smart plugs turned off, house alarm set to armed, heating turned off and so on..... or I could just continue to be silly and turn it into a TV controller https://twitter.com/imduffy15/status/1256954852996939777
As someone who's done lots of automation and lived with a spouse that isn't as enthusiastic about it, one of the key things to think about is intuitiveness.
The setup of "automatically adjusts lighting based on finishing brushing teeth before bed" could easily be "the bedroom lights do random and frustrating things when I'm trying to get ready for bed". The problem is complex interactions are hard to see, like what happens when someone does something out of order, or adjusts the lights to their liking before brushing teeth, or is brushing early after a late dinner or garlicky snack but not going to bed yet.
That said, if you can do it without annoying others, go nuts! It's super fun, and it's a great learning experience to spend weeks interacting with your software from the real (physical) world. You'll find tons of edge cases, and figure out how to deal with race conditions, less than 100% reliable signals, etc.
Some of my most useful automations are very subtle, like turning on a couple inside lights as it's starting to get dark outside but only if there aren't any lights already turned on. If we're home (and have manually adjusted lights), nothing happens. Yet we never come home to a dark house (There's a similar automation for front outside lights too). This is quite a bit more complicated than a simple timer, yet is so intuitive that you don't even realize you're interacting with it.
What I'd probably do is use it to control lights in the bathroom. You're supposed to brush for at least some amount of time, change the color of the lights as you approach that time.
My Oral B toothbrush came with a little digital clock that sticks on the bathroom mirror, when you start the toothbrush it switches to a timer that counts up, with a little quadrant indicator that changes every 30 seconds.
It also apparently grades how well I clean my teeth, but that appears to be based purely on 1 star per 30 seconds, up to 5 stars.
"because I am stuck at home and bored out of my mind" is a plausible theory to me, though really, I find myself asking the same question about why the hell a toothbrush needs to connect to anything but power in the first place. The toothbrush company's page on the virtues of their Bluetooth toothbrush is not very compelling IMHO: https://oralb.com/en-us/why-switch/
I bought one out of curiosity as to what it might add.
It’s sort of like a management consultant: The bluetooth allows my phone to tell me when I’m brushing my teeth. So I paid big bucks to find out something I already know.
UI wise: React JS with hooks. I can build everything on the webserver side and do everything with Async requests. It's great... as for on the webserver side... let's just say Not Python.
I deeply dislike the almost lack of compile time errors in Python. I like my programming language which as long as I know what I'm doing it will likely be correct once it compiles.
How is that different from JS, which you say is your favorite? Sure, you can have Typescript, but you can type your Python code as well and use something like mypy. I would understand disliking Python if you said your favorite was something compiled like Go or Rust, but it's surprising to me you dislike Python so much while still liking JS.
I've had mixed results with Google services over the years. I'm a G Suite Partner, and that part of Google has seemingly no awareness of UK VAT at all, so I have to fudge my accounts when payments come in.
Granted that's earnings not expenses, but it does play on my mind.
No. If you're not good at this then you cannot provide any guidance or advice. At which point I can just use reminders, or build an app with random positive messages popping up as notifications every week or so.
I was expecting something silly like Siri Shortcuts... tbh