Well, I've said this before. But people have different needs and patterns. Do I mostly need a removable battery? No. Could I sometimes bring a charger instead (more inconvenient, cables, requires time), yes, although not nearly as good a solution. Could I bring an external charger? Sometimes. But the ones I own are a lot bigger and of course they require a cable. You can't use the phone much while you're charging.
And then I travel a lot. So, I'm not a bike messenger, but even so there are circumstances where charging all the time is inconvenient and sometimes impossible. Let's see. In Paris this summer, I'm walking around on a bright sunny day. The screen is turned all the way up. Using Google Maps. Using the camera a lot. I go into a museum--still using the camera a lot. Checking the digital guidebook. I sit down for lunch at an outdoor cafe, listening to music, reading a book, editing the photos on Aviary, surfing the 'net (yay for T-mobile's international roaming data). Using French apps for things like metro info, SNCF info. Etc. I'd be into the low teens by 2 pm. At that point, I couldn't risk using the phone much more. Couldn't even get through a 9-5 day on a Note 4. I switched to an Anker double capacity battery (6400). That would get me to 5 pm, but not much more. (And I had no good case for it, which makes me nervous when I'm walking aimlessly around.)
Or, to quote your username,

, with a removable battery you can just do what you want and not worry about it. How is that a bad thing?
There's no quicker, more convenient or easier solution than a removable battery. And if this had not had one, I would've waited to see what the Note 8 was like. And LG might indeed have lost the sale, since my normal inertia makes me lean to the same ecosystem.
No. For one thing, I use a sturdy case. How could I tell how sleek it is? In any event, function not form is what it is important to me.