From a customers' immediate point of view, this sucks for you.
But it's great they are not regulated utilities. Because either everyone would have to pay for extra legroom, even if they don't need it, or some freakishly long people would not be able to pay for the extra legroom that they need.
Why do you think being regulated utilities would preclude having multiple classes of service? Airlines had first class before deregulation: https://en.wikipedia.org/wiki/First_class_(aviation)#History
That's not how regulation works. Or at least not how it has to work.
I don't pay a flat fee for my water, electricity, or gas usage, regardless of how much I use. I pay for the gallons, kWh, and therms I actually use. (Yes, there are other fees on those bills, but my usage actually matters.)
Airline regulation doesn't have to specify standardized seat pitch, etc.
Ah yes, because I am also forced to buy the same amount of electricity and water from my regulated utility regardless of need.