I think you meant neither of those things have proven to be true? If so, fire risk increases with design complexity. A simple box should be no issue, which is why I pointed to a finer design, like a delicate earring design from etsy or some such. That’s where overpowering can really bite you.
Yeah, and they’re quite dark. From 2017:
You can get a much lighter color than what you’re seeing at 170/150. In fact multiple cuts at very high speed is the lightest method. I’ve never tried to see how light I could get it, mostly because I’m impatient. I go for the fastest speed at the highest power that will get get it done in one pass.
Anyway, again, you’re not wrong, your way works fine for most things. Just something to consider if you ever want to speed things up or get lighter edges, or if you find a fine design getting a little too toasty.