I do like the comparison of Cessna 400 series to 777, it is so accurate. I mean the Cessna 421 for instance has had 24 accidents following engine failure, 12 involving fatalities. Now how many 777 have been lost due to a single engine failure, I reckon quite a few failures have happened including some on take-off roll, some with spectacular sparks and flames. But I'm pretty sure they all climbed away quite easily and returned to land after a few checks. As said before there seams to be a disconnect in education if you think the certification of these two aircraft is mildly related. Also the 15/35/50 ft clearance requirements are before you adjust for margins, but I'm sure you know that. A C421 wouldn't even have the performance on one engine to apply a margin. I wonder how many C400 (or any other piston twin) pilots would be told 'sit on their hands' following an engine failure after take-off to assess fully what is happening.