I think yours is a very key point. People are not all nice: they're either easy or difficult to work with.
Having done some customer support for various businesses, many customers (even the ones experiencing legitimate problems that aren't their fault) are reasonably polite, don't waste time asking pointless questions that can easily be answered with 30 seconds of looking at our site, and are relatively pleasant to serve.
It's a handful of customers that have contributed the majority of pointless customer service headaches.
> They call and ask the most trivial questions that are available right on the homepage without even trying to get the info themselves.
> They call us from a loud area and complain vigorously when we can't hear them or they can't hear us.
> They want to talk about their life and tell us stories from their day. In some cases, I sympathize if they're older or something that they want to have a couple of minutes of smalltalk, but there's younger people who think nothing of trying to occupy half an hour or more of a business's time for their own ego and pleasure.
> They outright lie about things that happen to try and get free stuff.
> They threaten with chargebacks to try and get free stuff (especially when they namedrop that they purchased on an American Express card).
> You'd be surprised how many people contact businesses they never even purchased from, confusing us for some other company they used, and being irate that we never delivered their goods and occupy a lot of our time providing incomplete information trying to look up their account.
Better UX and business processes can help to a point, but certain people are incompetent and/or think they're the center of the world and will be displeased almost no matter how well you serve them.
To some extent, I understand why in some cases mega-corporations try and make it confusing and friction-filled to contact them. If they actually did offer good support to everybody the way most of us are adult enough to handle, they'd drown under the weight of dealing with the confused morons and difficult people.