This is really a silly argument. Because let us look at the 2014 Barbarian. Is a Dex-bard worse at perception than a Str-Barb? No. They are just better at dex skills, of which the barbarian really only wants one in general. The entire reason the Dex-barb exists is because people wanted stealthy barbarians.
Now, Dex-Barbs aren't encouraged.... because you can have stealthy barbarians without limiting your combat stats. And Con barbs are still equally viable.
But the crazy thing? Unless you were a Barbarian who was playing 16 Con, 16 Dex, 13 Str and 12 Wisdom.... Every other barbarian EVEN DEX BARBARIANS are likely better at perception than they were before. Because even with that 16 Con, 16 Dex, 13 Str, 12 wis build that forsakes all of their ability to use rage and reckless attack... they will still be able to roll perception with advantage. And any Con Barbarian that went 18 Con, 16 Str... is still doing fine.
No build is actually being made weaker here, it is just that the normal barbarian is getting better in a way that they really desperately needed.