This is what makes them successful. They have so many devices that anyone can find one they like.
Not everyone.
And I'm not belittling them because having options is great. The problem I see is that they are all variations of the same thing--very similar (materials, design, software, etc) so if you don't like any of these aspects, you tend to be shut out on all fronts. And it's not exclusive to Samsung. Many companies apply a general design theme across their entire range of products--I understand there are cost benefits but at the same time, if you don't like their design, you often won't be buying any of their products.
Regarding the topic at hand, the flip phone--too big/bulky and inefficient for my tastes--would rather have a smaller profile with one larger, stellar display vs. too lesser versions. But I'm sure there is a market for this--nice bridge device to bring former feature phone users to the smartphone world.