Example: I needed to make a circuit with a logarithmic response to voltage that ran off single rail +5vDC. I needed about 200 copies of this configuration. I chose a low VCC rail-to-rail single-source op-amp from Digi-key. Twice. Both got EOL'd and impossible to get between the time I got my prototype done and the time I was ready to order in quantity.

Many ICs are produced for specific purposes for a short time and are never made again. As a "pro-am", its hard to navigate this part of the supply chain. Ostensibly a common part library would have smart people looking to make sure that a part remained source-able in the long term. If the idea became big enough, the CPL would cause these chosen parts to be so.