I whole heartedly disagree. Micrometers and millimetres are very, very different and that should be obvious to anyone that uses grams and kgs, or meters and km

I whole heartedly disagree. Micrometers and millimetres are very, very different and that should be obvious to anyone that uses grams and kgs, or meters and km everyday. Microseconds and milliseconds are obviously different orders of magnitude, that's sort of the whole point of SI prefixes. That CTO is just doesn't sound qualified for the job.