Because they focus on curb appeal. Their phones and TVs and appliances look pretty in the store so people buy them. It's not til you get them home that you begin to notice that they are trash. The next problem is that people may not even realize that the competition is better. If you buy a Samsung device knowing only that it looks good in the store, you probably aren't the type to research, so you think that's just how it is: Modern phones have weird confusing UIs, modern TVs have weird menu lag and ads, modern appliances just don't last the way they used to.