De-Ice
There is never a reason NOT TO, especially when external observations by another pro in the business sees a situation! This is not EGO stuff, this is pure Fight Safety. Next time I just hope/trust/pray that when someone calls in an observation, it's taken as a pure Flight Safety concern/notification.
Rant over, too much nationality banging-on here, this Flight Safety.
The ramp staff supervising this turn-around bear some responsibility also for not making observations.