The way I see it :
Neutral/Good path : you fight in order to survive/free yourself from the tadpole, maybe doing some good in the process.
Evil path : you fight for ultimate power 😈⚡. People aren't just going to hand it to you. Especially not evil people, goblins or drows. I don't know what else you expected? You want to be on top. Climbing = killing and/or cunning (ie : Persuasion checks).
And of course the companions would react to it. Actions have consequences.
So...in my opinion, it makes sense the way it is.
This sounds good and all, but it doesn't hide the fact that the Evil path (siding with the goblins) has significantly less content than siding with the Teiflings/Druids. Less sidequests, less rewards, less story content, less companions, less romance options, and generally less flexibility and variety of outcomes. The overall writing of it is also the subject of much debate as to its relative quality which bears drawing attention to, IMO.
Difficulty is one thing, and can be considered a good thing for those that enjoy challenges. (personally, I'd argue that the good path has more and more challenging fights than the evil path so far) But lack of content & questionable writing is another, pretty much always undesirable thing. Give more items to good npcs such as in the grove that can only be gotten by killing them to counterbalance the plethora of loot that gets thrown at you for playing a good character. Give party members and romance options (besides Minthara) that you don't get by siding with the grove. Give some actual sidequests linked to the goblin camp. Ones that don't set off the grove siege after completing them. Clean up the writing so it's more cohesive.
While we are on it, rewrite the option to help Kahga and implement an option to help the Shadow druids. The resolution to either of those options just screams 'cut content'.
