I would argue that "building, and leaving open" Wifi connectivity that is not even remotely obfuscated is proof in itself of "failure to consider security aspects".
Well, to be fair and comparing to not having a password at all - as they put those passwords in place they have somehow tried to protect it. Or make it look protected.
But I agree that it indicates that they haven't gave any consideration to it, and in 2019 that doesn't count as trying anymore. At least because we're talking about a well-established hardware and software vendor, not my grandma.
This is potentially dangerous as attacker can just drive around hacking power walls and schedule an attack on the grid.