It’s custom silicon designed for a specific, known workload. It’s not designed to be a general purpose part or to be future proofed for unknown future applications.
When a new application comes along with new requirements, the teams will use their experience to create a new chip targeting that new application.
That’s the great part about custom silicon: You’re not hitting general specs for general applications that you may not even know about yet. You’re building one very specific thing to do a very specific job and do it very well.