There’s a good argument for more modular kernels (microkernels and such). That way the driver could be kept going for decades, only updating the IPC protocol as the microkernel changes through time
It’s not something that you can really experience directly as the end user. It’s a base on which other features can be built. Most obvious would be fractional scaling.
Specifically for a job of Linix sysadmin, probably yes. If you can afford it do a certification, it will help you stand among other candidates with no work experience.
For other IT jobs it’s not so relevant. Linux is technically on the servers but the infrastructure is hidden from you by multiple levels of abstraction.