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> software is relatively easy to change

It really isn't. Not when any change can easily be the source of new defects/bugs, and the bugs get exponentially harder and costlier to fix the later they're introduced in the software creation process.

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Software is relatively easy to change compared to other engineering disciplines. It isn't universally easy to change, but it is relatively easy to change compared to rewiring a plane to convert from CAN bus to Ethernet or other things. Or changing out the engines on an aircraft. Or changing a bridge's support structure without taking it down.

>> until things get to the point of being a running system, software is relatively easy to change

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