It is self-evident. Increasing the block size may indeed make a coin more centralised but we are talking about using cryptocurrency to replace outdated systems

It is self-evident. Increasing the block size may indeed make a coin more centralised but we are talking about using cryptocurrency to replace outdated systems among banks, government agencies and brokers. In this case, it's not unreasonable to assume that the participants could afford to dedicate sufficient storage space to handle high transaction rates. There is no fixed limit on the transaction rate.