Funny how you mention tactical approach and then cite goals and assists. our fullbacks simply aren't good enough on the ball, nor do they have the stamina required to contribute in defence and attack, how many times have you seen them fail to get past their man or overlap our winger? it's usually a square pass inside, shirking any kind of offensive responsibility and congesting our attacking play. Liverpool have been transformed with young energetic fullbacks and if anyone thinks Young and Valencia are good enough to win the title, they are sorely mistaken.
The fullbacks (or lack of investment in quality ones) have been the one constant in our last 5 years of underachievement. We need to prioritise investment in these positions this summer. I see fans complain about our style of play all the time, two quality fullbacks would help us massively in this regard.