2900 - 800 = 2100 EUR to do whatever I want with. Even if I decide to put half of that into savings, that's still ~1000 EUR to spend freely, and any unspent money would go into savings too at the end of the month.

Or in other words: With a salary like that I would be able to pay a family member's full monthly expenses if they are in rough times, and still have leftover for myself.