Decided to continue sharing my experience. Perhaps, to convince myself that it was worth it? :-) Please ignore if you find this info useless...
I contacted CS via WhatsApp plat to ask for a partial refund for flight legs cancelled by finnair. Received response within the same day and was told that refund request was initiated. The next day received an email alerting me that the refund was processed. Very quick turnaround. Maybe, it is a coincidence and this post belongs in the "well done AY" thread?