Maybe it is just me, but I wouldn't call years of .378, .314 and .330 as putrid shooting. The .314 is nothing to write home about but we would take a guy alongside Haliburton shooting .378 or even .330 on this team in a heartbeat. .378 yields the same number of points as shooting .567 from 2.
And you're cherry picking as well. His .378 season came when his usage rate was much lower.
Freshman year: 31-82 (.378)
Sophomore year: 55-175 (.314)
Junior year: 66-200 (.330)
.314 and .330% with high usage IS putrid shooting in high level college ball and I'm scratching my head as to why anybody would think otherwise.