P2SH multisig can replace bare multisig, by moving the data stored in outputs to the inputs.

This also avoids bloating the UTXO database, the key database that is queried multiple times per second by all full nodes on the network.

Solutions have existed for years.  UTXO database is not the place for data storage.  It impacts everyone, network-wide.  It impacts the real-time performance of the network.