There is never a new and immature "gravity library" that requires you to rework your existing designs to cope for new slightly different acceleration due to gravity, the "metal fatigue" library does not introduce new unexpected bugs randomly, there is no reason for the "corrosion library" not being able to be used at the same time as the "average human adult male height library" due to obscure dependency issues, you never have shoe-horn in the "compressive strength of concrete" functionality that was originally out of scope but sales now say is P0, you never have bugs like unexpected-yet-sufficiently loud sound waves overflowing to tiny negative values etc and causing a "negative sound area" or something weird and hard to conceptualise.
I.e. physics itself is largely unchanging. We have worked out the fundamentals and they don't really change - gravity never flips direction, bounancy always goes "up" etc - and we're not building on top of a ship that is built on top of another ship that is built on top of a hovercraft that is built in top of raft that is built on logs that is built for a fresh water environment but you are using it in salt water due to the CEO being buddies with someone, but the people building the ship only see the first turtle beneath them.