I have been using click & drop for its convenience and it’s professional, scannable labels. It is also slightly cheaper than paying at the post office.
I understand, however, that post offices do not get paid for processing such post. Perhaps even doesn’t get registered on their workload. I’d say this is grossly unfair. I would emphasise I am in no way affiliated to a post office or know personally anyone who works there, but I know injustice when I see it!