If you are going through that much trouble you might as well get a WiFi scale, wear a tracker that has an API, etc. I’ve definitely thought about taking speech-to-text notes at work, nice to see somebody did it.
The problem is all those gadgets have their own APIs and quirks. For example, my WiFi scale often decides to silently not sync to my phone. Or decides to update my partner's weight instead of mine. OP is building on arguably the most natural API - speech, which is what all those smart assistants have been promising us for a decade. I think there is a lot of convenience as well as unexplored ground to be found in such a system.
Well yes, but this is a much cheaper option. Instead of having many smart gadgets you only need one. The mobile phone or some other microphone but that is the most obvious option.
Instead of paying hundreds of dollars for all these gadgets that have to be charged and kept safe you can buy cheap variants and still have basically the same benefits.
But your time is exchangable for money. (Something almost never reflected in hobby behavior: that's why the crafts store has 130 kinds of acrylic yarn and 1 kind of wool yarn.)
A $150 scale is expensive but buys a very small amount of software development.
