What are the issues of having 512 MB block sizes if it means that BCH can process upwards of 2,000+ transactions per second?

I had done some research on how the block size of Bitcoin affects the scalability and number of transactions. I understand that at the current state of BCH (with a 32 MB block size), BCH can process about ~144 transactions per second (while VISA can process more than 2000 transactions per second). I was just wondering since increasing the block size was considered as the solution to Bitcoin's scalability problems, what would be the downsides of having a block size of 512 MB or more? On paper, BCH would be able to process ~2304 transactions per second, and compete with VISA.

submitted by /u/1MightBeAPenguin
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source https://www.reddit.com/r/btc/comments/dsbc1b/what_are_the_issues_of_having_512_mb_block_sizes/