In 1.14.3, Pillager patrols spawn less often then they do in 1.14.2, and that is expected.
However, ever since since upgrading from 1.14.3 to 1.14.4, I have never seen even one pillager patrol spawn, even after hundreds of miecraft days.
The doMobSpawning gamerule is set to true, and the difficulty is set to hard. I was searching for patrols at night in a plains biome near a village, and it is completely unlit.
However, Pillagers still spawn in pillager outposts normally.