Trading a third round pick for a known commodity is a win every time.
Pretty much. Last 10 years of Boston's Third Round Picks:
2013
90th - Peter Cehlarik
2014
86th Traded - Mark Friedman
2015
75th - Dan Vladar
2016
75th Traded - Jack Lafontaine
2017
80th Traded - Kirill Ustimenko
2018
77th from FLA - Jakub Lauko
88th Traded - Joey Keane
2019
92nd - Quinn Olsen
2020
89th - Trevor Kunter
2021
85th - Brett Harrison
2022
87th Traded - Tomas Hamara
91st Traded - Ben MacDonald
2023
92nd - Christopher Pelosi
While the verdict is still out on the most recent picks, None of those players is make or break and the most notable player to me (Lauko) wasn't even Boston's pick to begin with.