I understand the feeling, and you may be proved right eventually; but sometimes it really is that easy.
For example, there is a robot used by some companies as a greeter, which costs about 32 thousand eurobucks. This robot has an open TCP port, which will simply accept any commands sent to it, thus allowing remote control without any authentication.
In addition this robot has an admin panel reachable over HTTP, which transmits credentials in plaintext, however even if that wasn't the case, the robot also has a default and unchangeable admin username, allowing easy bruteforcing considering there are no measures against that either. As if that wasn't bad enough, if you get those cleartext credentials, you can ssh into the robot, and immediately escalate privileges to root, because the root password is hardcoded to be root.
This is a bit off topic, but I think it stands as a good example. If you're interested in reading more just search up "pepper the robot hacking"