There are many reasons to be put off smartwatches, one of them is they cost the same as an entry level phone but worse battery life, smaller screen, less useful.
1) correct. They rarely last more than 1 full day. But I guess you're too old to learn to change.
2) they don't have to be for hearing, you can use them for filtering, they vibrate you look at them and flick away the notification or go to your phone. Personally I use them for biking, I can glance at my wrist on a bike easier than a phone as I just hold my wrist up, good when at lights hold wrist up aligned with the light and filter notifications while waiting. You can bluetooth pair BT buds to phone or if go with an LTE smartwatch to the watch. In UK they are also very convenient for contactless payments which are more prevalent than in US.
3) so this then calls for what I suggested, get a bigger phone, a phablet, if you struggle with 6.4" phone you can get 8.4" or 10.8" phone. Example in UK which I don't recommend as its price gone up a lot, implying there's a successor coming. The bigger tablets cause a problem of you can't necessarily keep them in your trouser pocket, so the idea of the smartwatch to filter incoming information off your wrist then grab the tablet, or go without your phone.
It is just a different approach, using mature reliable technology, with big screens, and a lot less cost than $2000.
Most people I expect will just buy one phone of the size / type they like and some will get a Wifi smartwatch and be done.