Though the Turkish had to actually order the Albanians to stop their killings for in killing off Serbs and Christians in Macedonia, the tax base was being eroded.
The Turks took a heavy amount of the agricultural production of the Christians they overlorded.
There are historical photos of Turkish soldiers having to escort Serb religious peoples in Kosovo due to Albanian attacks.
It was entirely unsafe to travel in Kosovo before Yugoslavia was created as the Albanians would rob and kill travelers.
One of their methods was to create an obstruction in the road, including rolling bolders down the hillsides, so the travelers had to stop and the Albanians would come down from the hillsides/mountains to rob and kill them.
Pass, Marko, don't pick a quarrel,This is your hero, a vassal. Serbs were the nicest vassals Turks ever had. Loyal, quiet and efficient. There was no shame in it either.
Or dismount and we'll drink some wine;
But yield to you — that I will not,
Though a queen did give you birth
In a pavilion on soft cushions,
And swaddled you in purest silk,
Bound you with golden cords
And fed you on honey and sugar.
Though a stern Albanian woman gave me birth
Among the sheep, on a cold flagstone,
And swaddled me in a black cape,
Bound me with bramble stems
And fed me on oatmeal porridge,
Yet she besought me often
Never to make way for any man!
source
Life under the Ottoman Empire, involving as it did for the majority population what would nowadays be called collaboration with the enemy. For example, the main hero of Serbian folk poetry, Prince Marko (Kraljevic Marko), endowed in popular imagination with superhuman strength and extraordinary bravery as well as great cunning, was a historical figure--in fact a small feudal ruler who, like all the other Serbian Christian nobles, became the Turkish sultan's vassal after the Kosovo battle.(for the record, after distracting and then killing Musa, Marko cries because he knows that Musa is a better man)
In one of the Serbian folk ballads called "Kraljevic Marko i Musa Kesedzija," Marko is commissioned by the Turks to kill Musa, represented in the poem as a bandit but in fact an Albanian insurgent against Turkish rule. The necessity to collaborate with the enemy induced in the Serbs a strong sense of inferiority and a correspondingly powerful urge for a violent compensation, both of which are reflected in Serbian folk poetry (later discovered and much praised by the Grimm brothers and other German scholars of the Romantic era). Much of that poetry is so violent and sadistic that in schools, as I myself remember, it was taught in a severely bowdlerized form.