Relevant video from Ann Reardon's How To Cook That about exploding Pyrex (and the difference between all capitals and all lowercase): https://www.youtube.com/watch?v=YVbkDAw4aJs
Turned out that distinction isn't too reliable when it comes to determining whether a product used soda lime glass or borosilicate glass instead.
Honestly, all I want is something that I can put on charge once during the day, for 30 minutes while showering, and have it last until the following nights shower. I want it to track sleep, and monitor health. That's it at least. My Fitbit Versa works perfectly for this, and hey, it has a bonus that if I forget to charge it one night or over a weekend, it still lasts! No interrupted heartrate monitoring or sleep tracking.
I was really hoping Apple would step up their Apple Watch game this year, with a longer battery and native sleep tracking -- that's all I want. Personally, I don't really care about being able to answer calls from a watch when I have my phone on me 24/7. Time to wait another year I guess and keep using my Versa :-)