An Idealized original intention of an Earth Meridian Circ. Metric system would have an integer fractional value of Earth units instead of the loose change addendum meters at the base of the current modern system. The Modern Meter is in other words too short of that Idealized value of 40,000,000 units circumference. Did an Idealized system once exist long ago? Yes it did and can be proven very readily. Dividing this number of units into a geodetic system of 360 degrees would give a mean latitude degree of 111,111.111 etc. Meters. Dividing it further into your aforesaid units of 300,000 parts would give a Remen value of .37037037 etc. Meters. Only this isn't the Modern Meter I remind you but the ancient one. Now if we make another rational fraction figure very well known for a diagonal unit multiplied by this figure of 99/70 for sq.rt. 2, we get .523809523 etc. Meter for a Royal cubit which maybe doesn't look all that familiar to some well versed into ancient Saxon units yet, but if that is translated x 39.375 ins. for this ancient Meter value it = 20.625 ins. Hmm!
A very familiar value for a Royal Cubit don't you think? Could this knowledge be one of the reasons for Not adjusting the current Metric system to it's former precision and accuracy?