Why would they be non-functional with today's technology stack? The whole stack is complex, but everything depends in general on very basic principles (eg: basi

Why would they be non-functional with today's technology stack? The whole stack is complex, but everything depends in general on very basic principles (eg: basic information knowledge about parallelism, how a compilation works, etc.. and hardware knowledge : how parallelism is handled, why do we need asynchronous jobs and how they work, etc..). Any complex piece of software can be decomposed into basic principles and very often without a lot of work. The only softwares that require more time to understand are the ones that solve some physical or mathematical problems IMO, as you need to understand the math underlying them. But again, this is not an impossible task