I'll be honest, I have no experience with new products such as ceramic but I will give my unhumbled opinion anyway. From a lifetime of doing autobody and paintwork, as a hobbiest but extensive, there are only 3 products. A polish, A Glaze and A wax. Such things as a ceramic sealant might only add to durability because ceramics are traditionally hard. But that hardness in the elements still won't last, it will also get dull. Just like urethanes will get dull if left alone. Then what? Well, you start with a polish again. You might as well just polish, glaze and wax your urethane, or enamel, or lacquer.
Polish does just that, it polishes. A multitude of agressiveness' are available.
Glaze, has the effect of a wee bit of filling action. Hence, it fills pores and hides swirl marks. Which helps to luster.
Wax, it's just a coating. I does seal and protect. But has minimal durability. In creating an ultra smooth
surface it allows maximum reflection of light, hence shine. A wax without additives has almost no durability. Pure Carnuba which gives great reflective ability has no durability whatsoever.
Quick Detailer, is a great solution to keep your car looking nice between a once a year good waxing because waxes don't last long anyway.
Urethanes were developed to give some durability and lasting shine to auto bodies because with the environmental problems of lacquer and the poor finish, durability of enamels the industry needed something. Ceramics may be the next step in durability but with the ability and flexibility of urethanes I don't think ceramics will be cost competitive. That's probably why you are seeing it more on very expensive cars. I personally don't think its necessary. Just marketing. The real expense car can tout 'boy I've got a ceramic coating'. Yea, who needs it.