It's clear from the length of this discussion that size DOES matter
That said, it's also obviously VERY subjective, like Goldilock's assessment of porridge temperature - what's just right for some is too big or too small for others.
That said, I concur with issybird that the jump from 6 to 7 inches is a
very noticeable one. When I got my H2O2, that was what really surprised me, how much extra screen space I got for that one inch. The H2O2 was also very portable, it fitted in most of my pockets even in its sleep cover. The Libra's shape does make it less pocketable than a Clara, and that may well be a factor that matters to the OP.