You answered your question with your opening post . You might have discussed this in your Whatsapp group, still, to have a replies from wide sample of people, forums are the only choice.
Even in Whatsapp, some groups are a PIA type, forwarding same messages over and over again. It is better suited for a small group of close friends. A forum is totally different, When I had newly purchased my car and had my first share of scratches, I was totally distraught. Got so much encourgement and advice from complete strangers that I forgot my aprehensions and was back to normal soon. Even now with so many members dormant, a new member with his first scratch /query will get an overwhelming response. This is not possible anywhere and for this reason alone, the forums will be there for time to come..