Negligence is ignoring glaring holes in the first team that have meant missing out on winning the PL.
As @Luca_from_Italy said, the problem is not quantity but top quality.
It's this negligence over several seasons of buying adequate players, rather than top quality players, that will see our only two genuine players of this standard leave, and along with it any chance we had of winning the PL or CL.
As for nearly winning the league, when we bought almost no one, imagine if we had have bought a couple of players we were desperate for.
We could have won the PL, and kept hold of our best players.
But instead we are probably going to finish behind spurs, be out of the top four and lose our best players.