When the original value is only precise to plus or minus half an inch, it makes no sense whatsoever to do a conversion that's a hundred times more precise.
A man says he's 6'6". Sure. If he's anywhere between 6'5½" and 6'6½", that's true.
You say he's 198.12cm tall. The range of this being true is now thinner than a needle. It has gone far beyond what anyone actually measures. In over 99% of cases, it's not true, and if it is, it won't be for long, because the human body isn't nearly that consistent from breath to breath.
The conversion with spurious false precision has made the number go from true to not true.
The man is six foot six, yes, true.
The man is 198.12cm - no he isn't.
I am 5'5" I have been flirted with by a surprisingly high number of near or above six foot women. The weird part is that most of them have known damned well I have the emotional capacity of a irate toaster in a research facility. Also I only get that they were flirting years later.
Autism and being abused as a child will fuck you up. Mind you I have more while by myself and with friends its just all of these instances were at work and well I am nothing but business, and part of business is telling HR that I put in time off as a courteous and I wasnt fucken asking.