That's fine. If they can't manage to make a service work using appropriate web standards then I don't think I trust them with hosting a service, my data, or to create adequate products anyway. -- I mean, what other corners are being cut?
It's quite probable that they are not cutting the corners that make them money and they're cutting (or might cut) everything else. After all, Firefox Nightly's share is a rounding error for Teams (and its users probably not Team's target anyway)
