I haven't tried glass yet but people report that it is MUCH less sticky than blue tape or cardboard or Kapton tape.
At MakerFaire NYC they used glue stick *and* had to heat the bed to 50C. When they didn't do both parts popped off.
But it's complicated. Each part is different. You can get away with neither for certain parts (small parts). It sounds like wood glue and water is better than glue stick.
It would be nice if UM had a scientist who would spend a month experimenting with sticking and then another month experimenting with fan speeds, then another month experimenting with bridging, then another week experimenting with maximum flow speeds. All of these with various PLA. Maybe some day. In the mean time we have to rely on people like Illuminarti who do pretty good job with these kinds of experiments (but don't spend the month the issues deserve).
The glue-stick is by no means mandatory. However, if you write in the manual "You might want to use it", it will often be interpreted as "You don't have to use it if you don't feel like it". As the manual is aimed at ensuring that you are able to create a successful print, this is a pretty logical choice to make.
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