Does MQ not want to support back test on MT4 and MT5?

 

MT4 always cover or remove the history data I downloaded and exported once connected to broker server. 

. Does it mean MQ doesn't want to support back test?

. Does it mean MQ doesn't want users to do back test?

. Does it mean MQ will waive the function of back test gradually? 

. Otherwise why does MT4 always recover the history data?