Blue
Ravenous Bugblatter Beast of Traal
THIS! We use the same. 4d6 in order, but I do make one concession for someone to make a better build or go for a concept they had in mind. You can make 1 swap.
Back in AD&D 2nd we did something similar. But instead of one swap, you rolled three sets in order and then picked the set that best fit the character you wanted to play. So it was still in order and very organic, but it gave you more choices to be a specific class that could fit the party, and avoided really bad rolls.