So? If the net result is more reliable memory, it doesn't matter.

Many things in electrical engineering use ECC on top of less reliable processes to produce a net result that is more reliable on the whole. Everything from hard drives to wireless communication. It's normal.

ECC doesnt completely fix it, it only masks problems for most common use patterns. Rowhammer is a huge problem.

Just like increasing the structure size "only" decreases the likelihood of bit flips. Correcting physical unreliability with more logic may feel flimsy, but in the end, probabilities are probabilities.