A loop on two chains is still one position. It just takes twice as much looking after.
The Mezzanine Prime vault runs across Morpho on Ethereum and Kamino on Solana. Build that yourself and you have capital on both chains, two sets of borrowing rates to follow, and transactions to handle on each side.
Opening the position is a task. Keeping it running is a commitment.
Prime brings that into one vault, with a strategy that optimizes borrowing rates between the two markets. You deposit and choose your tranche. The cross-chain position doesn't become your ongoing job.