That chain is local to each user of memo, so it can happen to you only if you do more than 25 actions before a next block is minted, and you have only one UTXO at your address.
By splitting the UTXOs, so that each user have several confirmed coins at the address. Or by warning the user "You are doing it too much. Slow down a bit' ;)
Well written. The reasoning for why limits were imposed in the first place by the core is clear. Intent was to cripple bitcoin. Are there security issues when limits are removed?