Polished concrete has grown massively popular over just the last few years because it has a number of advantages over alternatives. Even when you compare it to other stone based materials like marble and basalt, it has a big advantage; price.
Polished concrete can be made to fit a number of modern design styles, so aesthetically it can match the rest of a kitchen’s design quite well, but they can also have an extra layer of another rock based material added on top of the concrete to give it a different appearance without adding too much in terms of price.
Like using other stone based materials for kitchen work-tops and even flooring, perhaps the biggest advantage to these materials is the low maintenance and high durability of them. You’ll find that the polished surface will be preserved for decades, and if this ever ceases to be the case then all you’ll need is to repolish the concrete to regain the same effect, which is actually a pretty cheap process.