All airlines have schedule changes, and generally do not provide for free flight changes for minor schedule changes (10 minutes is minor). I think you've been lucky with QR (and/or have not flown with them often enough to experience this).

Sometimes they will provide more flexibility - if it suits them (e.g. your original flight is oversold but the other flight option is lightly loaded), or as a goodwill gesture to high status/high value customer. However, this is never guaranteed. It doesn't hurt to ask EK but don't expect a free flight change for such a minor schedule change.