Think about it from a product perspective.
The more users who can easily understand your UI, the more likely they are to use your product successfully -- or to put it more bluntly, to give you money. And guess what? Users with lower computer literacy or reduced cognitive ability also have money to spend. In fact, for most products, there are a lot more of them than there are of the self-styled power users “willing to take the time to learn something”.
Whether catering to the latter group -- by building extra interfaces, power features, or complex workflows -- makes financial sense, depends entirely on the product. If your user base is unsophisticated or their use cases are simple, building extra bells and whistles is just wasted effort.
Sure, some people slap the "inclusivity" label on all this and try to turn it into a moral crusade. But in most cases, it's just business.
And the counter-argument -- that “everything is so dumbed down now,” that society is addicted to “instant gratification”-- is pure elitism. It’s the same tired “I’m smarter than everyone else, why don’t they build things for me?” whining. Well, until society for some odd reason starts mass-producing geniuses, you’re a minority -- and in most markets, that means you’ll be ignored. It’s not that different from the LGBTOMGWTFBBQ crowd expecting bespoke accommodations because they believe they’re uniquely special. Sorry, but from a business standpoint, you're just not worth it.