It depends on the carver's skill level and the design balance between top and bottom cabinet doors. How about printing out your designs full size, then taping them over the doors you have? Also explore using a larger design on the big doors to the kitchen instead.

Big fail. Unless you are in a cabin in the woods. Even then, that’s just too precious. Have normal doors made as a backup for if you ever go to sell.

Would it be a fail for what purpose? Resale? Maybe/likely. For your own enjoyment and satisfaction of having done it yourself? No. If you like it, do it. If you are skilled enough to even consider this, you can always undo what you've done.

I would reserve the carved detail for two focal doors; maybe the ones flanking your vent hood, or corner ones where someone else might have glass, lighting and decor. Doing to many of them may feel busy and a bit overboard. If you're the carver, you may tire of the project before complete if it is too big. Plan it out so if after carving the focal doors you don't want to proceed, the kitchen will still look finished. Be aware that the carving, whether incised or relief will be a dust catcher and will increase the maintenance of the cabinets to stay looking nice.