I was under the assumption, that the 50/50 split only would be in effect on the posts written after the HF21 was life!
I am not completely sure but, I think it will backdate. PErhaps @eonwarped can weigh in.
The rewards will all adjust as people adjust and it isn't completely sure what people are going to do, et alone some of the largest stake voters.
Just continue to have some fun.
Once the hard fork has taken place, rewards paid out after HF21 will be as per new model.
That should not affect the actual STU already received for the post/comment but will affect the split.
Already received rewards were based on the then existing active stake balance. They are immutable AFAIK.
Yep, this is how I think it will work but am always unsure of the specific technicals, thanks.