Obsolescence is a dirty word for most engineers.
A successful, reliable product can be suddenly rendered unmanufacturable by a single component going End Of Life (EOL), or a new design hasn’t even gone into production and one of the chips has been pulled by the manufacturer.
Sometimes it is ICs, sometimes connectors or passives. Any component will have a finite longevity and even the smallest, cheapest, most seemingly insignificant part can jeopardise production of a whole product line.
If you can cannot ignore it, make sure there is a plan to deal with it.