1. Different companies have different focus and strategies. I would say Google likes to experiment, but sometimes has poor follow-through. Apple often waits a few generations before committing to new technology, so they often are not innovation leaders, but they execute well.

2. Roll-outs often do not occur all at once. There might be blockers which are not immediately visible, such as regulational, financial, cultural. A regulational example would be how Apple Watch's ECG was not rolled out world-wide at first, and was spread slowly as various countries gave approval for this feature.