I never use reward.app because I don't care to have liquid Hive and HBD because I am 100% focused on increasing my Hive Power.
I have always looked negatively at using reward.app because most of the time it is used to liquidate and take out HIVE and when I see a post with reward.app I generally don't vote for it.
After reading your post I realized that reward.app can also be used in the right way and from now on I will try to make a distinction before deciding whether or not to vote for a post with reward.app, so thank you for this post of yours

Comment rewarder, on the other hand, is a tool that I really like and has no downside because it incentivizes manual interaction. I used it once in one of my posts and will try to use it more in the future especially when writing tutorials.