Many people think Buckthorn is similar to an ornamental crab tree, pretty flowers in the spring and berries the birds love to eat ... it too just needs to be managed.
I like how we are discussing/debating 2 of the most least disiearable tree/shrubs species a property could have. there are others like honeysuckle,sumac, etc.
Good luck if you think box elder has benefits, it is a 3rd tier spies hardwood with little of no value. I will always remove it to favor other hardwood/shrub growth & regeneration.
I have spent many years removing invasives to try and establish long term beneficial trees, shrubs, & other plants.You can cheapen your efforts and seek short term gains, I look at the long term prospects & helth of my land ...
https://islandpress.org/book/for-the-health-of-the-land
If your land only supports a tree like this ... accept its results or sell the property
Oh, I wasn't saying it's beneficial. Just much easier to get rid of.