Software getting recreated, sometimes without the security promises (linux containers as they started vs. solaris zones) the previous solution had. To be fair,

Software getting recreated, sometimes without the security promises (linux containers as they started vs. solaris zones) the previous solution had. To be fair, Google didn't really need the security in linux containers, they didn't run multi-tenant workloads, so it wasn't their top concern when submitting code to the linux kernel... We like building new things, from different angles, but in the end it seems like everything cycles through the same ideas.