Japanese Self-Cleaning Ovens

From Andrew Gelman at Statistical Modeling we learn that the Japanese have no word for "self-cleaning oven".   That inspired me to search: inquiring minds wanted to know why?  Were all ovens self-cleaning, or what?  This led me to an interesting write-up on Japanese kitchen appliances.

It doesn't directly answer the question, but this is what I read between the lines:

• kitchens are small and appliances are small
• meals are physically small (no Thanksgiving turkey)
• ovens are small (microwaves now)
• ranges are gas (I presume given the size of Japan and population density fuel was never abundant, so no (i.e. "no" = "few') wood/coal stoves for cooking and no transition to electric stoves.