Not sure what you mean by 'playmakers with goalscorers', as Spezza & Marner have both traditionally been playmakers, and Tavares & Matthews have both been primarily goalscorers. Currently Marner is the playmaker to Tavares, and Matthews has Nylander as his primary playmaker. Like Notsince67 said, why fix what isn't broken?
Tavares has always had a pretty middle ground distribution of goals vs assists. He's only had more goals than assists twice in his NHL career. One reason it happened last year, it was the first time he played with a truly high-end playmaker. Secondly, for the first time in his career, his teams PP didn't run primarily through him lessening the number of touches he got on the PP and thereby reducing his assists in a likely scoring situation.
As for line-combos, it is pretty clear both Matthews and Tavares line work best with a gritty 3rd wheel who can win the puck back and not try to do too much. Kapanen and Johnson both tried to do too much. One, Spezza isn't going to be winning races down the ice and put on a heavy forecheck, and two, he is a guy who likes to hold onto the puck. Considering how often Barrie and Rielly like to activate in the offensive zone, it seems guys such as Hyman, Moore, and Miki, work better with their minimalist game over guys who try to control the puck and make things happen such as Johnson and Kapanen.
