they are a harmonic balancer of sorts however they will have little effect on a small petrol engine really, certainly wouldn't cause any bottom end issues on a TU from beign a solid lighter weight item.
where this can cause issue is on the more modern powerful Electronically controlled diesel engines as the power events are rather more violent in them than a small petrol engine, especially at peak torque, hence the use of dual mass flywheels as well to damp up the whole assembly, its well known for gearboxes to not last very long in some applications when a solid flywheel is used.
your bearing issues will have been caused by oil supply issues, be it low oil or oil surge, or cooked oil.
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