I certainly don't disagree, and wrote many an Arduino library and drivers and tutorials myself.

As long as you eventually take the training wheels off, and know that Arduino isn't a path that leads to being able to create financially viable products, and it's a first step.

It won't teach you certain good habits, but it will perhaps get you hooked and motivated, which is useful in itself, and does give you the satisfaction of making motors whirr and LEDs blink quickly.