No support for dynamic account reallocation, which limits the flexibility needed for certain Solana programs.
In Anchor, we can realloc attribute allows developers to resize system accounts dynamically.
example code in Anchor to reallocate size:
#[account( mut, realloc = (new_size), realloc::payer = payer, realloc::zero = true, )]
Adding reallocation support would be a valuable enhancement to the Poseidon framework
Example - https://github.com/solana-developers/program-examples/tree/main/basics/realloc/anchor