Maples create an amazing amount shade. The leaves are fantastic for mulch.
My yard had between 2 to 4 hours of sunlight due to the tree and various buildings. I am in northern New England zone 5b. I used to have a 400 sq ft backyard with a large maple tree on the east side. Taking the tree out was not an option since it was on the neighbors side to the property line. The maple tree was closer to 2 feet in diameter and sent huge amounts of roots into my
compost pile, garden beds. The tree loved having all the nutrients and water form my garden.
If you are going to be growing annual veggies you will need at least 8 hours of full sun unless you just want to grow leafy greens. You may not need to take out all the trees but you will need to track the sunlight on the yard before the trees drop their leaves. Also keep in mind the tree roots will go farther than the width of the tree and they will seek out your garden beds.