the penalty is way to harsh, and the "advantage" is conjecture
lewis was right on his tail into braking zone
nearly runs into him, side by side, nose ahead into the chicane
falls slightly behind kimi, but still overlapping
bit further behind but still overlapping when he turns to cut the chicane to avoid acciedent as kimi forces him off the road
know, quantifiable time/distances
FIA stewards went with well what if he gave up on his overtake when it still looked on, slotted behind kimi and followed him through.
ok on a dry track u could look at other cars and probably get a pretty good ballpark figure. but it was wet, on dry tyres, so how do you figure out a sensible figure for that?

and how do you know uve given x time back, until you reach a split time, requiring you to not gain time, or lose time cos you dont want to disadvantage yourself for a entire sector. ofcourse if your going by sectors then lewis is probably stuffed, cos he was gaining rapidly on kimi in the last sector.
all you can say is he "needed" to backoff more than he did, to more than a essentially undefinable amount, weve had figures from .3 to 1.5seconds banded about on here, and spin/crash.
and the stewards chose to ignore kimi getting ahead later, gaining atleast 4seconds or more on lewis, on the same lap as the incident. or that race control said it was ok twice. and McLaren where willing to give kimi the place back (which happened anyways). lets say he gained .4ths from his cut (he was .1 behind at the line?), .5 has been quoted by someone on here as a dry figure for the normal gap. if you look at the vid he loses atleast 4 seconds with his williams off compaired to kimi. thats only 10x+ what he gained during the cut if you take my figures.
IMO they've not used any sensible discretion, not followed what had happened in the past, not used easily/quick quantifable measures, not acted quickly enough during the race to raise the issue so we could have ignored kimi forced him into a offtrack or likely crash, ignored kimi hit him twice. ignored ontrack correction, ignored chance correction that had loanshark rate interest. ignored kimi didnt finish and was slower (not a major point) they also provided the media and fans with hardly any information aswell. what they did do is go for the most painful penalty they could which will likely be argued in the appeal you cant change it.
thats why alota race fans are angry at the stewards/FIA. and other reasons ive missed.