Do i need scree protector for gorilla glass 3?

by scratch proof they means keys or blunt metal. try fine grained sand and the results will be completely different.

So in short, yea we do need a screen guard for a phone even if it has Dinosaur Glass.

Pity, since the Moto E I bought for my sis will not look good with a "guard".

That is true, take good care and it will never have a scratch even without a screenguard.. I do recommend you buy a flipcase though, will help if you wear tight jeans

Yes, you do need a screen protector. I use my phone as badly as I can, but the only part which concerns me the most is the display, I take pretty good care of it, and when I take good care of something it's good. Yet I couldn't manage to not scratch a display. The only phone where I couldn't manage a scratch was Galaxy S2.

I will always recommend a good glass protector. It will not only protect the screen from scratches but from shatter too in case of an accident.