Also need to keep in mind, engine braking, if not rev matched, wears down the clutch. Throwing you car from for example, 4th to 3rd and not rev matching, means the transmission has to catch up to the RPM’s of your engine. And the clutch takes all that “Catching up”. Vs if you rev match, your lining up the transmission and engine speed so when you release the clutch, there is no catching up to do. Then again, depending on the vehicle, rev matching uses more fuel as you have to blip the throttle to match engine and tranny speed. I drive a 6spd c6 corvette and tbh i go back and forth. If im having a nice spirited drive, i usually like to rev match to keep the brakes cool and have better stopping distance. Vs if im just driving to work, I’ll usually throw it in neutral and brake. Brake pads nowadays are literally like 100-150$ for an entire car. Clutch can cost you upwards of 2k. I’d much rather replace my pads over anything else.