Way to completely miss the point, and then add multiple additional qualifiers to your " so again" that was not there previously.
Wilson has shown nothing offensively, even when playing with offensive-oriented linemates. Multiple other young players have produced offensively on the 4th line, whether it be on the Capitals (Kuznetsov, Brown) or elsewhere. Most of them have moved up the line-up as a result.
Fontaine, Raffl, and Maroon were three quick examples of players who have earned offensive responsibility on their teams by playing well. All of them have significantly more points (in addition to goals) than Wilson. Putting up 13 goals with guys like Brodziak and Cooke is showing a lot more than Wilson has shown. Playing well enough to enable your team to trade Dustin Penner for scraps is showing a lot more than Wilson has shown. Becoming a player that can shuffle up and down the line-up without an issue to plug holes and find chemistry is showing a lot more than Wilson has shown. None of those players were handed a cushy gig, they earned them with quality play and superior produciton when compared to Tom Wilson. There's no ifs, ands, or buts about it. Even a guy like Nathan MacKinnon started behind Duchene and Stastny on his team's depth chart, and has earned increased ice time.
Tom Wilson's play style is not a "coaching decision." It's how he's always played. He was a banger in Plymouth, he was a banger in the pre-season, and he's a banger now. The coaching staff has put players with offensive skill and territorial possession ability on the 4th line at various points. Volpatti and Latta have been benched in favor of guys like Wellman, Stoa, and Deschamps. If anything, it's clear the coaching staff wants more than just checking and fighting from the 4th line. Wilson hasn't provided that, nor has he shown any indication of significant untapped offensive potential or an inclination to change his game. If we wanted offensive production from Wilson, he should have stayed in Plymouth where he could learn to pick his spots and play with the puck.