1Password - Intelligent password same pattern and length

@ag_yaron, I'm also interested in the reasoning behind the pattern detected by the OP. My question (and I suspect the OP's) is:

Why is there such a pattern in the first place which lessens (to some extent) the strength of the password? From casual viewing, both a random (or non-patterned as I'm told truly random doesn't exist in the computer world) string and a patterned string appear as gobbledygook. Therefore it can't be due to user convenience so why not go fully random to secure the maximum strength instead of using a weaker patterned code? Is it a programming convenience and, if so, how much harder to code, or slower to decrypt, or more resource intensive would fully random string generation be in comparison to the patterned algorithm currently used? Thanks in advance for any light you can shed on this fascinating (to me, at least) topic.