Multi-currency (MC): Pros and Cons of making all COA currency specific

 Currently setting up a client with MC (base currency is USD) and one company is EUR.  What is Oracle/E1 position on making all accounts currency specific (under the EURO company), i.e., Monetary accounts/currency protected, versus just specific accounts, (e.g.) EUR on bank accounts and other cash accounts.

Thanks and your your thoughts are appreciated...............D