Casios are great. Which model do you have? Btw, I can't believe that in this age, people need the recharge their watch once a day. It's like we went backwards. How often did you replace your battery?
I did consider the DB-36 and the the GB-5600. But I eventually ended up settling for the GB-5600 because I liked the square design. It does come with bluetooth and other early "smartwatch"-features which I don't use, but the vibrating alarm is very handy.
I have a couple of wearables of various degrees of sophistication. I've stopped using them unless I actually need, for example, GPS tracking in the case of the Garmin. Otherwise it's just something else to charge. I know about how active I am on a given day.
Yes, unfortunately Casio went for Android for their smart ProTreks :( Such a shame, I would have loved a rugged watch from them with some smart features but no silly cloud connectivity.
Polar, Garmin & co are just a bunch of WaaS (watch as a service) providers.
Not to distract from your point but my Withings gets a charge every two or three weeks.
It's handsome, and doesn't do much aside from track steps and heart rate. You can set it up for notifications, though I don't. Hits the sweet spot for me.
I believe I went through 3-4 batteries over this time. So every 5-7 years. Funny enough, the wristbands were wearing out faster than the batteries.