[rschiks]

Or is this just handy, so you don't have to use another app? :-)

Precisely.

Similar to Youtube: instead of searching for some videos somewhere, I can just load up MY lists and have it all right here, within the app
Same with Trakt: login, load up MY lists and everything is right here at my fingertips.

These smart remote apps are much more than just "a remote". The purpose of remote, in the end, is to select what you want to watch.
One can either use the remote, to navigate menus on Kodi, and go through different plugins on Kodi to finally select what's need.
Or one can use the remote to quickly pick what's needed right in the app, and just play it.

I prefer the latter

Thanks for the hard work.

OK, honest answer! I have already been succesful with accessing the new trakt tv api.
I will put it on the to do list.

Currently I am busy with adding movie sets.