To be pedantic, I think it does matter there, but the cost / benefit tradeoff is in favor of the 10 year old processes.
And it can vary too, mass produced / generic chips can be more cost efficient if they can make more of them on a single wafer.
And it can vary too, mass produced / generic chips can be more cost efficient if they can make more of them on a single wafer.
I thought a big part of the reason why that's the case in general is because the old fabs that house those old processes have already been depreciated - customers basically only pay for maintenance and the of raw materials.
But that doesn't really apply to brand new fabs.