Automation only hides the complexity. It doesn't solve it. Try using an acme1 client these days. Try using an older computer that has some LE expired root cert. etc. Over years it will break and then you've got a facefull of complexity.

Yes, it hides the complexity making it so that it is simple to the average person which keeps the barrier to entry low.

Updates can be automated too.

I suppose you're right, it does slightly lower the barrier to entry compared to doing all the cert stuff manually. But not compared to HTTP itself. Then the first time it breaks (and it always will over a few years) the barrier to continuation is even higher.