Please note that we do not recommend deleting this application, since there are base objects depending on it and it may resolve in issues on the site. If you don't intend using it, better to simply remove (hide) the sections from the workplaces instead of fully deleting it.
Not that I am happy there is an issue, but you are avoiding us from doing a mistake. 8.0.6 does not seem the best Creatio version (albeit going in the right direction !)
Will refrain upgrading our on-premise clients past 8.0.5 until this is properly sorted out in 8.1.x (most probably will all the changes planned, 8.1.0 will not be properly ready either, and will wait for minor fixes first...)
I can see myself wanting to transition entirely to Creatio Studio. If all components that are used on OOTB sections/objects are available in the no-code designer, it feels like it's much better to start from scratch, given no customisation ends up like anything OOTB.
I'm also hoping that there won't be performance issues for instances set up prior to 8.0.6 as it looks like so major changes of base packages on 8.1 forward