opinions on this new trend?

I think it’s weird if you hate your sister. I know for a fact my first answer would be
“Getting to see one direction when she was too young to go to attend concerts” or something silly like that. If you have hidden animosity towards your sister this trend is NOT for you

I feel it's the recording of it that's.. odd. My sister and I have discussed things like this and it's a more raw, emotional conversation. How parents treated you, insecurities, parentification, etc. Talking about it helps stop you from completely resenting each other, especially if you can talk with a therapist about it too. But putting it online publicly for everyone is only going to invite unwanted attention from bitter people who will choose a side and make things worse.