There are so many vectors in which this is wrong.

1. You need to be conservative as possible with changes if you’re trying to create sound money. Moving complexity to second layers makes a lot of sense because modifying core is too risky

2. You would lose all privacy. Having every transaction that can ever happen on an immutable public ledger is just dumb and will eventually fail.

3. Larger blocksizes screws up a lot of networking and mining., and so many other things. It increases IBD and makes it harder to sync with other nodes.

I could go on but this has already been gone over a thousand times