While you are correct, here is a fun side fact.

The electric signals inside a (classical) processor or digital logic chip are made up of many electrons. Electrons are not fully well behaved and there are often deviations from ideal behavior. Whether a signal gets interpreted as 0 or 1 depends on which way the majority of the electrons are going. The lower the power you operate at, the fewer electrons there are per signal, and the more errors you will see.

So in a way, there is a a repetition code in a classical computer (or other similar devices such as an optical fiber). Just in the hardware substrate, not in software.