Adding to above, more grievances (added to those mentioned early in the thread):

-impossible to change an automatically assigned seat when flying on Eco Light, even if willing to pay. You are being redirected to a website.
-when a gate change occurs, the app is slow to reflect it. E.g. last thursday in MUC, my app BP still showed unspecified K gate long after I saw on the screen that my gate actually is Gxx.
-last but not least, miles now post WAY slower than before. LH/LX flights usually posted within 36 hours, whereas now (Tuesday) I still don´t see last Thursday´s flights posted.
-ceterum autem censeo boarding notifications should be put back!

All in all, the new app is a huge disappointment to me.