the thing about good assisters are.. they are statistically not prolific finishers... this not necessarily suggest they dont have the skill ...
but as the skill to assist is much rarer to find, people who have them will be placed much deeper , meaning they will waive the opportunity to concetrate on positioning and goal poaching which is the most easiest and succesful way to sscore many goals.....
they also instictively became more complicate minded when receiving the ball ... in a flash of mind when receiving the ball, they will first assess the situation and postition of both the goal and other players, while natural goals scorer will naturaly only think where the goal are first..
dribbling playmakers also bcoz of their dribling skill tend to draw out defenders to them and which every touch they make. the mark and resistance will be tougher .. thats the stage where he will need a natural finishers to pass to as there are no way to go..
in any case i believe that as you hard to find natural playmakers , natural finishers are also gems... its not about matter of skills as i am sure most you can do the basic skill with eyes closed while playing at the park... but more important untrainable factor , that is finishing and opportunistic instict.. the tendacy to create easiest situation where he can use the most easiast skill to make bunch of goals in competetive games..... i am sure all the profesional strikers passed all the basic skill test you throw at them, but not all of them score as much as David Trezeguet, Christian Vieri , Shevchenko and Dario Hubner every year... so the basic impression 'ohh.. even i can do that..bahh' is just totally baseless...
when i have to choose in terms of importance, goal scorers ar more important bcoz goals win and save matches. But assisters are important as well the same with defending and goalkeeping skill.. so if u have the best assister in the game, but not have the best of natural finishers ,goals are still hard to find..and your team will end up losing coz good assist play mean nothing if they are not finished.. while as many English team have shown. you can also score a lot of goals without have one appointed playmaker, but rely on variable team plays...