Say what you will about the guy's limitations, but there is something that is intangible to this squad.
When Conte first took ever, Pepe was one of those players that epitomized the toughness and grit that Conte looks for in a player, and that attitude that Pepe brought was infectious. The undefeated squad of that season was not the most talented squad in Serie A, but they had the most heart.
Last year's squad was simply more talented than everyone else, so his loss was not felt as much
This year is different though. Serie A has made leaps and bounds in terms of quality, and teams that had the talent but lacked the proper direction (Roma and Inter) are starting to live up to the abilities of the players.
Juve is still probably the most talented team in Serie A, but when the playing fields are level, you need that something extra. You need that type of player that will run into a brick wall for you, shake his head a few times, and do it again.
That is the type of player that Pepe is. I'm not trying to make him out to be a world beater, but he brings that grinta and energy to the squad that is lacking right now, and he is anythiong but a liability out there.