The mining difficulty has nothing to do with block sizes.
That’s what makes sure blocks time averages 10min.
Discussion
So you suggesting an additional dynamic factor. Not sure I see the reason, care to elaborate ?
Why does the block size need to stay fixed?
It doesnt, but if its not fixed you arent describing how miners are incentivized to secure the network. I thought you had thoughts on this based on your initial post, good day🤙🤙
Again the block reward will.