Milliseconds (msecs) has always been popular as well, in part because it uses a different schedule method then seconds and the one for milliseconds appears to be more reliable on the SmartThings platform:
If I had to guess why, I would go with the following, although I don’t know if it’s ever been confirmed:
Anyway, the point of all this is that over the last two years power users have been educated to think in terms of milliseconds, so I expect you will get that request.