Yes, however you may still have to use the manufacturer’s underlayment to have a warranty.
Carpet and padding are petroleum based products and therefore increase in price as the cost of oil increases.
One of the rubs against ceramic tile is that it is cold and hard. There are floor heating systems available to make your floor more comfortable to the touch, but in terms of hardness, yes, ceramic is much like hardwood in that it doesn’t have much give. If you want something that has more cushion to it, perhaps you should consider a floating floor.