thanks a lot for the great feedback!
We will remove the mentioned filter issue in a next version. Automatic deletion of completed actions is a good idea. We will look into this and see what is possible here.
Did you took a look at the free and open beta of NextAction! 3.0 Pro Beta? It comes with VoiceActions which is also made for quick usage - simplicity is paramount!
There is also a new promotion video for NextAction! - just in case someone is bored right now and want to check it out: NextAction! at a Glance