&gt;  The resources required to produce and support a whole new ISA are a major investment<p>It&#x27;s not that hard, really. With such powerful tools as LLVM, a new ISA can even be designed and implemented with all the tooling by a very small team.<p>What is hard in all this ISA business is the backward compatibility concerns. Once you&#x27;re liberated from this, you&#x27;re free to do whatever you like. They may want to experiment with a family of ISAs, maybe entirely incompatible, targeting different device classes (instead of a single ISA across the range).<p>Source: experience in the mobile GPUs design.