i noticed something

[BigPigfootsie]

I may or may not be late to the observer hype, but I was messing around in singleplayer
apparently observers detect repeater updates, as well.
this means that you can derive a signal from the side of a repeater.
das niceee

[PabloDons]

Yeah, they don't detect block updates anymore, they detect block change events which is basically the same thing but with pretty much every possible change included. It triggers a block change function within everything in proximity and doesn't affect the blocks in any other way. This is good because block updates can be laggy as hell

[PaukkuPalikka]

except they fail to detect a block getting powered by redstone which sucks :'(

[qwerasd205]

except they fail to detect a block getting powered by redstone which sucks :'(

That's because blocks don't change actual information about them when they get powered.
(someone please correct me if I'm wrong)