It's summer, it's habitat, if you do it in the autumn then everything has a chance to move on, do it now and you stop everything that is using it.
and it is far easier when the foliage has died back on it and surround foliage,
the wood is easier to cut when the sap has dropped,
tree cutting is a autumn winter thing if you know what you are doing.
in a garden you are far less likely to end up with accidental damage,
and you are far less likely to shock the other plants, if you do it when they are in winter mode,
It burns well if seasoned properly, but it will season better if cut in late autumn, it not a great wood to burn green like ash, but a good middling heat,
so many reasons, I'm sure I will remember more in a moment.