What is the definition of a highly insulated and airtight home?

I was contacted by a research company that asked me to tell them about the future outlook for highly insulated and airtight housing. I was told that a major home appliance manufacturer had requested that three people, including me, be named to provide a report.
Yesterday, I had a remote meeting on ZOOM, and I once again felt how difficult it is to define a highly insulated and airtight house in the first place.

First of all, even if we say high insulation, what standard level, G1 or G2, should it be?
When we talk about high airtightness, will the C value be set to the unbelievable number of 5 that the government once stated? Or will it be set to a slightly better number like 2? Or will it really be set to a value of 1, which would make both Type XNUMX and Type XNUMX ventilation effective?
Even if these numbers were decided, it is extremely difficult to grasp the number of buildings at this point in time. Furthermore, it is extremely difficult to predict how they will change in the future, even with very rough figures.

However... Ichijo Komuten's 3000 salespeople nationwide explain the importance of ultra-high insulation to about 40 people looking to build a house each year. We have told them that the effects of this technology are steadily being felt.
After the meeting, I realized that the most appropriate definition of a highly insulated, airtight home would be whether or not airtightness measurements have been carried out on all or most of the homes.

Since all buildings are airtight, the C value is likely to be below 1, and the UA value is likely to be easily below 0. In addition, the percentage of companies that have begun to take measures to reduce winter solar radiation and block summer solar radiation is thought to be significantly higher than companies that have not done so.