> If you take this attitude you should write all of your own tools, make your own hardware, not use any libraries (I might actually be able to make a case for t

> If you take this attitude you should write all of your own tools, make your own hardware, not use any libraries (I might actually be able to make a case for this one). No. Just...no. There are more than the two possible positions, its not either "ignore technological dependencies completely and blindly give your balls to a single vendor" or "create everything yourself from the ground up". You can look at your stack and consider how vulnerable you are compared to how much you gain. Sometimes you will find that it's worth it going all in with one vendor, but it should be a conscious decision. Business have to consider their vulnerabilities all the time and it boils down to compromises and tradeoffs.