This fixation on "importance" is laughable. It is "insane" to drop Gmail because it makes them a shitload of money. That is how corporations work.
The reason people mention importance is because corps like Google don't just care about per-product profitability, they assess how one product affects the rest of their business.
The reason people mention importance is because corps like Google don't just care about per-product profitability, they assess how one product affects the rest of their business.