I understand your argument, but before you have changed it for the first time, you should have talked about it first by asking for the reasoning. 
You don't even have 10 edits, yet you started to change tagging of other people who did it hours before you. 

Leave the `pedestrian`  be and don't add access tags, thats value is already default for the type of highway 

Please talk back and see that even though we have got `living_street` type of highway, within that zone, `highway=pedestrian` is mapped all alright. 

Again, get experience before you want to make  apoint. 