I agree, Metric is good, ...
Actually, metric or imperial has nothing to do with it. In the early days of house construction a person would use the materials at hand in the sizes easily produced and managed. Eventually, it was found that a board 2" thick and 4" wide was an ideal size for house construction. Some years later, governments started examining how houses were built and why they burned quickly. It was found that rough cut lumber caught fire much quicker than planed lumber. So government mandated the use of "planed" lumber. There were several other decisions that led to the use of kiln-dried lumber.
However, they also standardized materials at that time. It was found that a large sawmill would use a circular saw with a 1/4" wide tooth whereas a small operation would use a much thinner band saw. Government mandated that a 2x4 would measure 1.5"x3.5" to allow for drying shrinkage, sawing, and planing. Then other materials, (i.e. gyproc) were produced to augment a stud wall in some way. They took the 3.5" thickness of a wall, add a vapour barrier and finally the gyproc to produce a 4" thick insulated wall, plus exterior cladding.
When Canada switched over to metric it was found that converting building materials were so ingrained into imperial measure that it was found to be too costly to covert the industry to metric.
Any attempts to convert the industry since then have been met with a confusion of machinery and standards all based on imperial measure. Canada examined carefully changing it's national building codes to metric but shortly into the project it was found that there were so many dependencies that it was impossible to engineer a migration path at that time. Perhaps sometime in the future. Perhaps Harry or some of the other metric proponents could save the world's governments billions of dollars and provide that "perfect" migration path.
To give you an idea of how pervasive imperial measure is, I bought 200 concrete retaining wall blocks. They were expressed in "approximated metric units" which turned out to be converted and rounded imperial measurements. It seems that the molds and machinery used to produce the blocks were made many years ago in imperial and are still in use. That's another source of problems for metrification. Who's going to pay to upgrade machinery that is 50 years old and still working economically and efficiently.