My Series 4 just barely lasts all day with some activity (music, workout) and the phone at home all day (forcing use of the LTE when not at work or home.) Functionally, I would describe it as a pager, feature phone and iPod on the wrist.
An iPod, a phone, an Internet communicator. Are you getting it? These are not three separate devices. Apple reinvented the original iPhone :)
Thanks for your comment, now I am considering to get one.
Haha, yes! The Watch does feel like the early iPhone years. If you can take advantage of Apple’s return policy, I recommend trying one for a few days.