You're right, proper prep and maint is key.

My point about safety covers was since solid "safety covers", unlike mesh safety covers, accumulate water on top, they're not a "true" safety cover. Now of course if you are diligent about removing accumulate water, the both offer far more safety than a traditional water bag tarp style cover which can be a death trap.

I should note that there are also "solid" safety covers with a mesh panel in the center that helps prevent water from accumulating on top.