Hey I’ve done the same. I know better now, but I certainly haven’t always.
My point is only that people blame the spacers, but, I would bet in a lot of those cases the spacers weren’t to blame as much as maintenance.
It’s definitely a consideration, with the spacer/adaptors you’ve got twice as many lug nuts to maintain torque on. More parts means more things to go wrong. But all things being equal, the spacers are safe if properly maintained even if it’s more work to do that.