Why make fullscreen the default display mode?

[Garbg]

Borderless is like fullscreen but it works with screenshot software e.g greenshot. I've heard that being in fullscreen decreases cursor latency on windows. Is that the reason?

[peppy]

doesn't it tell you this in settings already?

[Gonzalo-Bruna]

Borderless is like fullscreen but it works with screenshot software e.g greenshot. I've heard that being in fullscreen decreases cursor latency on windows. Is that the reason?

I thought it was quite obvious because this happens with every game, but don't you notice input lag when not playing with full screen?