Yep yep. They are just a convenience. For many (most?) people, the conveniences might not be enough to outweigh the inconveniences. I have a Samsung Gear Live, and I love it. It's big -- bigger than most people would want their watch to be -- but I have large wrists, so it fits me nicely. There's nothing it does that feels like a must-have feature, but it adds a number of little conveniences that I really appreciate. For example, when I put meatloaf in the oven, I raise my wrist and say "Ok Google. Set a timer for one hour." and walk away. Even if I'm nowhere near the oven, my wrist will vibrate and I'll know it's time to serve dinner.
Things I like about it:
* I don't miss as many notifications (I often don't hear my phone, but the watch vibration gets my attention)
* I can read notifications easily while on the go, and I can react to many of them with gestures and voice commands
* I can use voice commands for simple actions like sending texts, setting timers, etc. without pulling out and unlocking my phone
* I use it to control media software (for example, skipping videos on Kodi on my living room TV or songs on Spotify in the car), again, without pulling out the phone
* It's another piece of many Tasker recipes (home automation and more)
Things I don't like:
* "Is that an Apple Watch?"
* Battery life (I get about a day and charge it overnight every night, so not a big deal)
* It doesn't have a speaker -- I can imagine some additional use cases if it did