But I don't see anyone claiming a native app is the difference to profitability.

I don't think they do, most "office worker" computer resources are way over provisioned, at least in the developed countries.

Does resource consumption matters to me? yes, but that is because I compile stuff, run VMs, do simulations, like many other developers.

My grandma or dad at his office? they could do just fine with 1/10th of their resources.

This is not an argument for wastefulness, but the reality of business world and the value of computing resources.

If the owners get rich by cashing out on an IPO, that sounds like a "recipe for success" to me.