Do these companies hire thousands of employees a year? I doubt that.
Private offices for everyone just doesn't scale at the same growth rate of tech companies. Where would they realistically fit thousands of new employees per year if everyone had their own office?
> I benefit from my equity holdings in tech companies. They are choosing to give that money to me in valuation instead of building out proper offices.
And you expect the buildings to just magically expand for new employees? I'd rather not take a pay cut, and "settle" for comfortable cubicles. Or better yet, work remotely, and get a raise from the money the company is saving on not having to pay for my office space.
You are conflating costs with difficulty. I agree that it is difficult to manage growth. This is a way in which some organizations create more value per person and per dollar expended.
One approach is for an organization to use open offices while they are building out proper offices.
Go visit any good law firm or CPA firm.
I benefit from my equity holdings in tech companies. They are choosing to give that money to me in valuation instead of building out proper offices.