I tried through and most of the time they send us back same info we get through webform or GCMS notes..again it depends on the person in MP office if he/she is dedicated to work they would assign an officer to follow up on it based on reply from IRCC which happened in one person's case and got approval which he is thinking the reason for approval might be that as his file was untouched for many months...so yeah MP office can have a positive impact in making our files moving forward but dont expect that in everyon's case...
MP office cannot make any changes or authorize for approval but they can be a medium to make some moment in the file to speed up or bring it to the notice of officer working on our file by follow-up...as they serve for public..
Coming to my case i emailed on march 29 got reply from them saying they will enquire on behalf of me and ever since then no reply from IRCC or MP office..and no movement in the file either..