This is quite an interesting topic that made me a bit "furious" yesterday when i saw the 19%. Honestly speaking i changed at least 10 witness votes to witnesses that had set it at 20%. I only have 2 out of my total votes with lower than 20% set APR because i highly appreciate their work here.
I have read way to many comments and posts regarding that matter. We pretty much have one side complaining that people will see 20% and think that this is some kind of scam, or that it will increase inactivity in hive, or that it is not sustainable anymore. These people want an APR lower than 20% which varies from 10% to 15%. The other side is pretty straightforward and wants the APR to remain the same.
My opinion is for the APR to continue being 20%. First of all, if you check the profiles of people stating their opinions, the vast majority that is pro lower APR, either have no HBD savings or have less than 100-200HBD. The people who want the APR to remain the same have from 500 HBD and up, with an average of let's say 1000 HBD. Literally, you can check every profile in the comments it's a pattern :p
Thus, i think a lot of opinions are biased, especially from people that are not hold any HBD :p If you check my account, i have basically the same amount in terms of dollars both in HBD and Hive so at the very least you can't say i am biased.
At this given period, the 20% APR is quite sustainable and you can read many relevant posts regarding that. The argument about inactivity is inaccurate. If in fact, you check most of the users with let's say over 500 HBD they are quite active, maybe more active than others with zero. The people that are a bit inactive are those with huge sums that are in the top positions, these kind of people were also inactive having a huge staked hp and simply setting some autovotes. Finally, people from outside not believe that this amount of apr is real, either way, they will have their doubts, and they need to do their own research. before i started with steemit back in the days i was afraid as well i didn't believe that i could write anything i wanted to and earn money. It took me 3 months to sign in, thus if i did it others could do it as well.
I don't think there is an actual reason to change the APR currently, instead, we can pay attention to the DHF and how some people taking advantage of these money