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Getting the party size to six is likely a rather unworkable solution when it comes to balance and performance
Not really. Just give the enemys higher levels, or add a few more.
Goblins for example are not known for being formidable fighters individually.
They just breed like Rabbits and overwhelm with sheer numbers.
We encounter a lot of Gobs in the EarlyAccess version but the groups itself NEVER felt overwhelming.
The combat AI is also leaving much to be desired.
It sometimes stops mobs from following you over a certain distance.
Or they just attack you with obvious disadvantages.
I wish they would seek out cover sometimes.
And a greater partysize in general seems very desirable.
Since the encounters would be way more epic and it may also allow for much more tense feeling powerhouse enemys to appear.
Enemys like
* the Owlbear
* the Minotaurs
* the Beholder Demon
Ultimately I know they are balanced to be defeatable with 4 groupmembers.
I liked this sense of dread when I entered battle with unfavourable positioning. No eternal Easymode hell yeah.
And if 5 or 6 people stand in a bad place, the Bigshots balanced for max-party seize will feel even more overpowering.
There is one thing I regret not trying back then.
Just shooting at the Red Dragon with an Arrow before the dialoge scene starts.
Can nothing give me a total sense of hopelessnes and despair? Apparently not. Not if I can place my group with foresight.
But I feel the RedDragon + his Githyanki bastards would truly push it to the limit.
Just how I like it.