The best quality leathers (top- and full-grain) are quite tough and practically impervious to everyday wear and tear, and any minor nicks and scars simply become part of the natural texture as the hide "repairs" itself over time and should not be regarded as defects. In many instances, stubborn nicks can also be polished away with leather lotion. I have an iPad cover from Oberon Design whose surface, after over a year of constant use, has seasoned into a lovely patina characteristic of the best leathers.
However, low-to-mid grade leathers (including semi- and faux leathers) as well as polished and painted/top-coated leathers generally are more susceptible to damage, and generally will not "heal" themselves. Consequently, they require more careful handling than a full-grain leather
These leathers can feel softer, but that's because they've been treated inside the tanning drum for longer, weakening the internal leather fibres; consequently, these need more gentle handling because even a simplest accidental scratch is irreversible.