I'm not really prepared to explain why being ignorant about your tools is toxic to good work, but I'll offer this: If everyone knew C, would they keep writing

I'm not really prepared to explain why being ignorant about your tools is toxic to good work, but I'll offer this: If everyone knew C, would they keep writing the same code over and over? Obviously not. They'd find new ways to compose what they've already written to create whatever they want. It's not a waste of time for more than one person to know how to do something. People start from the bottom and learn their way up. In your example, what happens the next time they need to align another element? They either copy and paste whatever they did before, or google it again, right? If they had taken five minutes to learn it before that, they'd already know how to do it, and could just write it. Redundant knowledge is not a bad thing.