Jason Kidd took 3 3pointers a game his rookie year. He shot 70% from the line. He was a bad shooter not a non-shooter. Rondo was and still is a bad shooter, but again, not a non shooter. Rondo took like 20% of his shots from past 16 feet his rookie year, and shot 10% better from the free throw line than Simmons. And Marcus Smart? He shot 33% from 3 his rookie year.
3PAs attempted rookie year
Smart 272
Kidd 257
Rondo 29
Simmons 11 (all full court heaves)
Data not available for Kidd but % of shots beyond 16 feet rookie year
Smart 66.2%
Rondo 20%
Simmons 3.9%
Simmons is not a Rondo, Kidd or Smart level shooter. He's a Deandre Jordan, Dwight Howard, Shaq, Clint Capela quality shooter. Those guys do not learn to shoot. Ever.
Here's a
list of players who shot <60% from the FT line their rookie year, and shot less than 20 3PAs. You can play a game of Where's Waldo and find the shooters. The only semi-competent shooters I see on there are Vucevic and Jamison, who don't really fit, because they were always shooting mid range jumpers at somewhat reasonable clips.