First party console titles benefit from the financial benefits that they are funded by a platform owner, and they are funded by a platform owner for reasons beyond making that single title as profitable as possible.
e: Its not "to the metal coding".
Its time and money (which are basically the same thing).
Time and money is exactly why multiplatform title don't take advantage of it usually. I highly doubt naughty dog is asking new hire applicants if they know assembly code bc of marketing fluff.