No, only the big companies have the finances to hire and train people to specialize but they choose expert contractors who specialize in it because even they can't fund and maintain a permanent workforce that deals with approvals either.
A permanent workforce and the required guru expertise that a company may need to carry from onset and during actual design periods is different than the one that gets hired later on with no real experience. It is an undertaking to train new staff them to design, fix and maintain a developed product at this timeline as related to fully developed product cheaply, even if they wanted to.
A given startup that starts and grows up with specialized staff is not the same as the one that has been using contractors since onset. You can't convert one to the other easily because the expertise are not typically transferable in short and medium timelines at a low cost.
They have to stick with their methodology.
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