Wales needs all the help it can get. By confining appointments to Welsh speakers only the pool of knowledge, experience and ability available is unneccessarily limited. It is entirely legitimate to support and protect the Welsh language but by keeping English speakers (and other non-Welsh language background applicants) out of public appointments Wales itself and its people are diminished.
In another language related example the practice of duplicating utility bills and information in Welsh and English creates unecessary and avoidable waste. Consumers should have the option of receiving this material in one language or the other. Some useful savings would flow from this change.