Not sure why this is on the front page of HN. I find it mildly interesting, but it's a wikipedia page and there's no relevance to recent facts or discussions.
Anybody could help me understand?
The stuff I have seen tends to be large on a scale reminiscent of the very first computers. (ie, large mechanical switches powered by solenoids or spinning gears)
But it has some pretty neat examples, not doing computation, but a programmable system for moving, storing, and mixing samples.
Fluidics are order of magnitude slower and larger, but proper material selection can make them withstand very high temperatures.
https://imgur.com/uwPSpR5 from Fluidics Quarterly Volume 4 Number 2, page 54
Even though fluidics came out at the wrong time it did find some niche applications in aerospace and factory process control because fluidics was more reliable than similar electrical and electromechanical systems for a bit. Fluidics not having any moving parts is fairly robust and is tolerant of high temperatures, high shocks, high radiation, high magnetic fields, and more. The concorde actually used fluidic components in one of it's nozzle control systems at one point.
Because of fluidics inherent EMP resistance and acceleration resistance, fluidics has been considered shockingly recently for use in anti-ballistic missile guidance systems.
Fluidics still enjoys some niche applications today. Some HVAC and industrial control systems supposedly use fluidics. One interesting current day application of fluidics is kosher sound amplification. Orthodox Judaism prohibits electronic sound amplification on the sabbath because it constitutes work. Using a speaker to produce sound constitutes labor because it creates a sound that did not exist before from electricity. Fluidics is able to get around this prohibition and can amplify sound in the range of human speech.