That's so unbelievably not true. Both can be difficult in their own right.
Making a lot of revenue is certainly not easy. Not a lot of business models scale up to making hundreds of millions or billions of dollars of revenue per year. Achieving that part is ridiculously difficult.
Making profit, on the other hand, is relatively simple: just control costs. We're making many millions of profit per year because we have a high profit margin. Making profit, relatively speaking, is easy.
For us to grow to hundreds of millions of dollars a year in revenue, that will be hard.
The idea behind valuing "top line" revenue is that the leverage there is unbelievable. If you increase your efficiency by 1%, you've instantly made tens of millions of dollars per year in profit. In the meantime, most companies voluntarily choose to pour all of their profits into growth, like hiring ahead of the curve.