Comment by kstenerud
There are no guardrails. Whenever something goes wrong, you'll get weird cryptic errors in a seemingly unrelated area and have no clue how to fix it until you post to a support group to discover that you put a comma in the wrong place.
You'll spend a LOT of time fighting the system, which gets old fast. Docker may have a sucky plan format (and they STILL won't let you set your goddamn MAC address), but it's good enough for most things and not too terrible to learn.
Oh, and my personal favorite: Programming by maps.
Any time you put in a key that it doesn't recognize, it just gets ignored. So you get to spend hours/days trying to figure out why the hell your system won't do what you told it to, and won't even validate that what you put in makes sense.