A stupid question. I see metre is officially defined based on the speed of light:
The meter is the length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second.
My question is why don't we update it with a sharp number. Why couldn't we first define
c=100,000,000 m/s, then define metre as a length
... length of the path travelled by light in vacuum during a time interval of 1 / 100 000 000 of a second.
Wouldn't that be better? Is that just too troublesome to change or is there any other reason I neglect? Thanks