Is there a benefit for having your goal as 50 xp a day?
You get through your tree faster.
If you have a lot of time to burn, set the level high, otherwise you might become a Dulingo slave.
It makes you more motivated to do stuff. I set mine as 250 in my head for some time. That's how I have around 1800 XP.
It encourages you to keep going since you have a high goal. and you can get through the lessons faster. But you might have a lot to strengthen.