Why is something like "alksjdlq" or "alskjdlakjv" weak? Do brutal force attacks focus on any combination of characters? or combination of known words?

If the password above is not a word, or a combination of words, or something personal, and it's long enough... how is it not a strong password?

Also, if you five away what a strong password consists of (case, length, characters, symbols) then doesn't that make it weaker because you give bots/attackers a pattern to follow?