I came across this question today which reminded me of an answer I posted earlier to this question. I flagged the question as a duplicate of the question I answered earlier and explained my rationale in a comment, which resulted in the closure of the question. The OP then deleted their question.
The duplicate asked "How does a Capacitor fix video noise?", which I felt would merit a substantially similar answer to the one I gave to "What is a filtered power pad on flight controller?" in explaining how capacitors can help reduce the voltage ripple which can be at fault for video noise.
When I noticed that the OP had deleted their post, I voted to have it undeleted. In my view, the closed question is a valuable alias for the question I feel it duplicates. I've seen examples like this on Stack Overflow several times where duplicate questions are left to hang around because they can help other search terms get to the answer.
Should we keep questions like these visible on this site?