So-called professionals pruned our two Crepe Myrtles. It appears to be that they just deadheaded, but did not actually do appropriate pruning. It appears that all of the long branches are still there, and I see quite small projections (large twig sized ends) at the ends of those branches. I did not measure the diameter of those end-points. The trees appear to be quite mature - perhaps they are about 12' in height.
Crepe Myrtle Pruning
Certified GKH Gardening Expert
These articles will help you: https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/best-crepe-myrtle-pruning-time-when-to-prune-crepe-myrtle.htm and https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/pruning-crepe-myrtle-trees.htm