I'm confused. Are you agreeing or disagreeing?
My disagreement...
"They are dangerous"
No they are not. They are perfectly safe.
My agreement...
Plugging incorrect things into a power outlet is bad. Many people are stupid and/or uneducated on what is going on with what they use/do in many aspects of life. I don't call that dangerous on the controllers part at all...that's human error.
Why and how are a persons most important questions. If I don't know how to make or do it myself somehow(at least the general concept of what's happening), whether practical todo so or not, I don't feel comfortable doing or using it. And won't till I am. If there is no other option and I must use some help/paid to do...then I will be picking their brain till theyre sick of me and ask me to leave or shut up. But you would be surprised at how many professionals will talk their way threw things out loud, and you just need to absorb it. As well as research things yourself.
When we are talking about major growing, not hobby...a master gardener needs to be an electrician, engineer(many fields), carpenter, botanist, chemist, salesman, marketer, lab tech, personnel manager,...the list goes on. If wanting to be like them...like using equipment they do...then get educated. That's where I stand.