I mean this sincerely, not sarcastically: can you locate candid photographic evidence of the newly-planted trees providing - not just SHADOWS on the brick - but comforting SHADE for actual humans performing an activity on the plaza for a duration of time? Such as, providing a more comfortable environment to a group reading a book, or eating a meal on a sunny day?
EDIT: To put a fine point on it, the presence of trees does not by itself make a pleasantly-shaded environment.
These trees along Stuart St. in the Back Bay are something like 20 feet tall, with bare trunks until around halfway up, and then branches and leaves that fan out and provide extremely comfortable summer shade for walking pedestrians. Directly comparing to
these more recent street trees in Chinatown, they're pretty, but not really optimized in placement or design for providing shade to the usable area of the sidewalk. Per
dhawkins' photos, it looks like some of the plantings may meet my standards while others wouldn't. Decorative trees that are 10 feet tall with branches starting 3 feet up are not able to be walked under, and are not shaped or planted in places to provide intentional summer shade to tables or benches.