Before moving to the Sony A series I used Fuji X system. One thing that impressed me about them was how they kept improving AF performance via firmware updates.
The A6300, based on specs I've seen, has the same processor used in the A7RII and A7II.
The A6300 has more PDAF points than the A7RII with what appears to be better performance. This suggests that there is room for Sony to improve A7RII AF performance to match the A6300.
One can hope