I think I found it: Sorbus torminalis
also known as wild service tree or Elsbeere
Apparently not all Sorbus have leafletts, wikipedia says the genus is as big and varied as Acer!
It flowers and fruits
The oldest recorded age for this species is over 200 years! (
https://www.monumentaltrees.com/en/trees/sorbustorminalis/records/ - handy website btw.)
So it definitely wont die on me, at least not of old age. I did not expect this since it has "berry" in its name.
I think I will add one to my collection
And I hope Ill remember to check out the Sorbus genus more closely
Here are some pictures of Sorbus torminalis I found online
From the young trees I found it looks like the leaves will reduce nicely, but we´ll see