It’s not practice when you have buckets of brass you need to separate , it’s just what it is . A necessity that results in Experience
My buddy is RSO and I’m currently training to be and a member at the range I shoot . I don’t need to pick up brass I get it by the bucket full if I want . I just recently separated a 5 gallon bucket full of very mixed brass . This is how I know it’s way better to separate them when you only have one or two in your hand rather than a 5 gallon bucket full of crap