There are some sounds that English singers find quite difficult to manipulate.
Mozart has written opera, symphony, sacred and chamber music - not to mention his piano and violin concerti.
If we perform the romantic repertoire we need more musicians.
As you know, there are certain languages that lend themselves very easily to vocal use.
Taste is changing, style is changing, and players abilities are changing.
If the (British) Arts Council give you money, they also tell you how to spend it.