Would you use a web-based email client where, with one login, you can access all email addresses you care about? Not in an unified inbox, but have them as separ

Would you use a web-based email client where, with one login, you can access all email addresses you care about? Not in an unified inbox, but have them as separates. Say cmd+1 is quickly switching to address #1, cmd +2 is switching to address #2 and so on...