I have used it many times and have not had any issues with it. With any app you will see issues even loads of people have complained about the official DJI go app. If the app is not working you just need to switch your remove to go back to P mode and the R/C controller takes over full control so you dont need to worry about that.
I think the main reason for Litchi is that i find it much easier to plan a mission and some of the POI features are great for making cool filming missions. However you can still create waypoint missions with the standard DJI GO app too.
As for the active tracking, it works ok if you have a fast enough smartphone but its not particularly great in some situations. I would not get it if thats your only reason.
My suggestion would be to just use DJI go to start off with, get used to planning waypoint missions etc… and then if you find that some features are missing then go to litchi