The world is a vastly easier place to live in when you're knowledgeable. Being knowledgeable opens doors that you didn't even know existed. If you're both using the same AGI tool, being knowledgeable allows you to solve problems within your domain better and faster than an amateur. You can describe your problems with more depth and take into considerations various pros and cons.

You're also assuming that AGI will help you or us. It could just as easily only help a select group of people and I'd argue that this is the most likely outcome. If it does help everybody and brings us to a new age, then the only reason to learn will be for learning's sake. Even if AI makes the perfect novel, you as a consumer still have to read it, process it and understand it. The more you know the more you can appreciate it.

But right now, we're not there. And even if you think it's only 5-10y away instead of 100+, it's better to learn now so you can leverage the dominant tool better than your competition.