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The reason is that you will be burning the friction material (Ferodo) on the clutch disk. The clutch disc is comparatively expensive and hard to replace, of course, it's depending on the model of your car.
Leaving your automobile into neutral when coming to a stoplight will save you a lot of trouble. If the vehicle is in gear with the clutch pressed, premature wear of the throw bearings which are going to be pushing against the diaphragm spring will occur.
The engine has a tremendous gear disadvantage so flooring it will lug it. Lugging an engine is like hitting the engine parts with every single explosion in a cylinder, or you might need to find a transmission repair garage.
It racks on the rod bearing/journals, makes the pistons slap to the side of the cylinders carefully, and if it's done enough times, it could break the piston rings. It also produces a hammer effect all the way through the drive train. This is definitely not okay for your clutch or gearbox.
There are springs in the friction disk (of the clutch) that take up some of this hammering, but they will only take so much before they wear out as well. This creates premature wear all the way around. If you want your lovely car to last a while, you don't have to do this.
It's way better to drop a gear or even miss one, it's all OKAY if you can rev-match!!!
You must understand what's happening in your car's transmission. Using your car's gearshift as a hand-rest can cause premature wear of the transaxle shift forks on a manual transmission. What will happen if you are having a static component (gear forks) pressing against a rotating element?
This one looks pretty obvious and straightforward. Holding your foot on the clutch pedal means your clutch is not completely engaged, so there can be a little slim. This means you are not. Pulling down full power which will lead to higher fuel consumption. You are wearing down your clutch, and again you are also wearing your throw bearing...
One extra we've learned from a transmission mechanic - it's not a good practice to shift from high gear to low gear without evening out the RPM, if you only rely on the clutch to match the engine rpm with the speed of the car, it will definitely wear out much earlier. So do not forget, it doesn't matter what car you drive, proper usage of the gearbox will ensure it's survival!
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Source: Engineering Explained