What gear ratio for a street car w/occasional track use?

I've been using stock Flywheels for a long time, 20 yrs with a Lakewood scattershield and bellhousing never had any issue with a stock flywheel and have not had any clutch "explosions" yet either.
Everything is balanced the clutch goes with the flywheel to be neutral balanced with the rest of the rotating assembly

If flywheels seldom fail then why run blowproof bellhousings ?
And if stock flywheels dont fail often then SFI steel failures must really be non existant.

these are meant to be legit questions... not trying to be wise guy.