It does not introduce incompatibilities with earlier 5.x models? Frontier models are at a point now that there will never be a need for another major version bump, aside from those chasing marketing gimmicks. They are smart enough to adapt.
A major bump will be warranted if/when we can truly separate prompt from data.
not true. multimodality is still far from being solved
Why would incompatibilities have anything to do with a major version bump?
What would it mean to be incompatible with the other 5.x models?