Angel of Attack wrote on Oct 23^rd, 2020 at 12:42pm:

Alex T wrote on Oct 23rd, 2020 at 9:59am: Also, with your margin of 593 feet, at my company that would not be enough of a margin. That short distance could be gobbled up almost from doing a rolling takeoff and non-SOP takeoff procedures. In TOPCAT I look for at min of 1000ft and by then I should probably be at a higher flap setting. The line-up distance used by Boeing and our company for -200 is 19m for TODA and 38m for ASDA, just about 100ft, and the rolling takeoff should have "negligible" effects about TOD as FCTM. And the TOD here shown is for Engine failure at VEF(1s before V1), OR, for all engine*1.15. AND, for airborne to 35feet, that's quite some margin for you to actually overrun the runway....

Yeah I agree it’s “safe” if it returns takeoff data, not familiar with Boeing software or what TOPCAT uses in the background as aerodata / sabre are all I’m familiar with. Just stating 600ft in a simulator considering how some flight simmers do things procedure-wise, may seem like an almost  overrun to simmers. Especially when runway lengths in FS don’t always match real world lengths. But again, of course the TO thrust simulation is off in CS, that’s the main point.