Motivation
Armory currently holds address & transaction comments/labels as data appended to the wallet file (zeroed out when replaced/deleted). While it would be nice to keep comments in a separately backup-able file, the data is typically not critical and has not justified the effort to add complexity to the application to accommodate separate backups (or at least a backup that doesn't also include your maybe-encrypted private keys).
P2SH changes this.
Most P2SH scripts will be recoverable if you have backed-up the relevant wallets (which is likely available for personal P2SH/two-factor-auth setups). However, multi-signature transactions executed with other parties, such as escrow or various contracts, is considered critical data. So is the contact information of the other parties in the transaction. Reconstructing your own wallet will not help you find P2SH/multi-sig transactions involving your wallet, and even if you could, it would not help you figure out who the other parties are. You s