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To me, smartwatches are about making my life more convenient (not taking my phone out of my pocket). So any inconvenience is going to be a big deal.

Having gone from a Wear OS watch with ~1d battery life to a hybrid e-ink watch with ~2w battery life I don't think I'll ever go back, even though I'm giving up features. You already mentioned travel, but an even bigger issue for me was that if my watch didn't get charged overnight for whatever reason (watch wasn't sitting correctly on the charger, fell asleep with my watch on, etc.), I'd basically have a paperweight on my wrist the next day. And having to disable features (always-on display) to get my watch to last through the day always felt silly.

Overall, it's just one less thing to worry about on a daily basis. If I ever see a low battery warning on my watch, I know that it'll still last for more than a day.