I think it just speaks to how quickly the tech has developed. Airliners work more or less the same as they did 50 years ago, computers are vastly different (and vastly more powerful).
Yes, this drastically understates the change in computing but the actual technology hasn't changed that much, it just got denser and faster.
The biggest change from then to now is probably the amount of solid state electronics onboard. That's ridden roughly the same curve as other industrial and commercial applications.