Using 2 digits for year is as wrong as using 8 bytes for year.
scale of damage is very different, so "as" is up to discussion.
Eh, using 2 digits for year is a lot ‘more wrong’ than 8 bytes. Since all (current) known use cases can fit in 8 bytes for the conceivable lifespan of human civilization.
2 digit years don’t even support the use case of ‘store the current year’ fully.
Don't wake me up when year 9,223,372,036,854,775,807 rolls by please.