Wrong OLC Start/End time

Many may not realize that the start/end time they see in the OLC daily
results, flightbook etc is the logger on/off time, not takeoff/landing
times! The takeoff/landing time are only available in the flight
detail page. So pilots using the OLC flightbook as electronic logbook,
log erroneous time (unless they turn their logger on/off at takeoff/
landing).
Suprisingly, this was the way OLC display start/end times for years,
perhaps from the beginning. I reported to OLC and they promissed to
look at it.
This also brings another question: Is it still required to log time
using pencil in an official paper log book, or printouts from
electronic logbooks or spreadsheets are acceptable?

Ramy