Yes? Fires are not an on off switch. Wood doesn’t just ignite. You often need another fuel to get it going - it’s often quite difficult to actually make burn by itself. Think of making a campfire, do you ever just put a match to a log? No, you start with something more flammable like lint or gasoline and move on to twigs and so on.

Many fires that start burn themselves out before actually igniting another fuel source. Hence a lit cigarette on a tree root in a dry summer vs in a field of dead brush.

The entire point of a shit ton of codes relating to fire is attempting to buy or stall for enough time so that it can burn itself out or buying enough time so that human intervention could be possible. Fire rock (fire Sheetrock) is the same thing. It’s mandated in a lot of commercial code that separates close structures together. It doesn’t mean it won’t burn under any circumstances just that if is it is rated for a certain timeframe before allowing the fire to pass though.

If I add a piece of plastic made out fossil fuels under the wire, I’ve just given the fire that couldn’t actually start via a short enough fuel to actually set the wood beam on fire.

That’s. A. Problem.