"Modularizing" the runtime sounds like a good idea, but also adds new constraints: they would have to document the interfaces between the various modules and th

"Modularizing" the runtime sounds like a good idea, but also adds new constraints: they would have to document the interfaces between the various modules and then either keep them unchanged, which would hinder further development; or if they change the module interfaces, the modules will have to be updated nevertheless, so having modules won't be much of an advantage...