But why does the church allow altar girls????--This has puzzled me. Was it those who want to change the church pushing the envelope as far as they can?????
I'm sure there are a number of factors at play there. Certainly there are those who want to push the envelope. Others simply want to see greater participation by the laity in the Mass. By the same token you have the laity doing the first two readings with only the Gospel reserved for those who are ordained.
The alter serevers (regardless of sex) aren't doing anything that is reserved for those of clerical status, so it's really not that problematic. The over-use of EM seems to me to be a much more serious stretching (and there are those who would say breaking) of the rules.