Must have! Nobody will ever use those features and besides you need to have a powered iPhone in your pocket for them to work, and the iPhone does all that and more. I’ll tell you what the Apple watch is; a status symbol. So the wealthy can display expendable income in order to attract a mate. Might as well be a gold chain. Sad. Very, very sad.
Ok here’s a list of the features;
“GPS, fitness tracking, music, calls, text if I'm out on a run (LTE required), 2-factor auth, Apple Pay.“
Now why would you need them running on an Apple watch when you have an iPhone in your pocket? Justify the $400+ expense and charging hassle to me. I’ll give you heart rate tracking although a good heart rate tracker is $80 w/bluetooth and an app. You don’t need the watch for any of it is the answer. You’ll get there. Think about it
None of these are needs. Phones aren't needs. You know what you need? Food, water, shelter, maybe clothing (environment dependent, though I'd recommend at least some footwear in most of the world). Those are literally your only needs. Everything else is a want.
The thing you seem to be willfully ignoring is that if you want those capabilities and have an Apple Watch (since that's the specific device we're talking about, others would also do) you do not need the iPhone in your pocket in order to have those desired capabilities. You can leave it at home or in the car, and go about your life with those capabilities on your wrist instead.