Really the only reasons to use { -brand-name-ie } are for developers to test what their sites look like on an older browser or if a company has business-critical apps that only work with the { -brand-name-ie } browser.
Mewn gwirionedd yr unig resymau dros ddefnyddio { -brand-name-ie } yw i ddatblygwyr brofi sut olwg sydd ar eu gwefannau ar borwr hŷn neu os oes gan gwmni raglenni sy'n hanfodol i fusnes sy'n gweithio gyda'r porwr { -brand-name-ie } yn unig.