[Dehstil]

If by "defective" you mean has rounding errors, then sure. Everything that rounds numbers is defective. To be fair, round errors can sometimes be mitigated by carefully changing the order of operations, but never fully eliminated in those cases.

[michaelmrose]

You can avoid rounding errors 100% of the time for as long as you like. For example you can use integers.

Its entirely possible to have any reasonable degree of precision reasonably required to the limits of our tools to measure.

This isn't about an inherent limit of computation its just programmer error.