This is the wildly controversial thesis put forth by 21 Years: Richard Linklater, a new documentary about the director, out just as his film Boyhood begins an awards campaign. Technically speaking, a long-form appreciation of Linklater doesn’t seem like it has a clear audience. Those who already admire the director may not find a stunning level of insight, and the curious but unindoctrinated would be better served by starting with one his actual films rather than a rundown of them. But there’s a certain satisfaction in a rundown of a career as rich and varied as Linklater’s, not unlike the pleasure of watching a well-edited Oscar tribute reel.