Because we’ve always done it that way is not an effective way to justify your organization’s methods, strategies and actions. Especially when it’s clear they’re not working.
Because we’ve always done it that way is nothing more than an excuse. At best, it’s lazy and fairly benign. At worst, it’s an enemy of change and malignant to the core.
If you run a dry cleaning service, because we’ve always done it that way isn’t likely to hurt the world around you. If you run a transit system (or any large, government entity), because we’ve always done it that way holds the potential for all kinds of trouble down the line.