I gave this a second thought ...
And i believe we are not looking at the problem from right perspective.
Take those examples that were used here:
Opening the pod should be regular Strength roll ... i agree, for the first one, not quite for the second.
Its not that Barbarian is the only class "strong enough to try" ... its more like Barbarian is the only class stubborn enough, too focused on using his raw strength only to continue, despite there is no sign of progress right now ...
I mean what is difference between Barbarian and Fighter in Roleplay perspective?
Especialy if they both have same Str?
Fighter is using techniques, manouvers, their defense sustains from effort to gain mastery of blocks, parries, dodges, counterattacks, and their attack focuses on simmilar things, effectively using their armor searching for weaknes in enemy defence and then use it!
Barbarian on the other hand is usualy simple brute they dont bother with blocking, or avoiding attack ... since they simply can take a few ... same as they dont bother with trying to overcome enemy defence ... they simply break right through it!
I mean i dont say that "every barbarian have to be like that" ... but that is the most "common" picture i have. :-/
Same goes with others ...
I dont think that Barbarians are so discuisting monsters so they eat shits ... i think they are simply intimidating enough to force the Goblin do that ... even to be completely honest, i dont like reaction of our barbarian ... sure they are pleased with themselves, but still ... its fucking discuising, and they SHOULD take that in concideration. :-/
The last example i would like to react on is roaring ... while this indeed seems a little random, i dont think it would need much changing.
In my honest opinion in most cases all Larian would need would be to switch the word "ROAR" with some narrative description of showing your raw strength and your will to use it.

I dunno, one time they can describe anger in our eyes ... next time they could describe how we flex our muscles ... next time we can i dunno, grit our teeth ... or display our battlescars ... the possibilities are endless. They are all non-werbal threats and i like the idea and would certainly love if they would be maintained as they are ... but just roar to everyone is indeed cheap and kinda stupid.