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First, I'm not an electrician, or anything even vaguely approaching one.
I've never heard that advice with extension cords, only power strips.
You could theoretically link enough extension cords together to cause problems, but it would need to be some extremely shit extension cords or a LOT of them. Resistance increases over distance, which in power cables manifests as them getting hotter. That isn't a problem until all the sudden it is a problem.
For power strips, the main danger is that you're potentially introducing more outlets than any of them are rated for. If you're just using 2 3ft power bars to functionally make a 6ft cable that you're only plugging a single thing into.. you're fine. Or at least I was, idk I did it for like a whole year. If you're plugging 16 things into a single wall outlet via power strips you can trip the circuit breaker, or potentially much worse stuff can happen like things getting melty and starting a fire.
If you know enough of what you're doing to math out the power draw+what your outlet/power strips are rated for you can pretty (afaik) safely daisy chain them if you wanna.
Yeah, there are two components here
2 is the main problem, but you need a little of 1 to have it fail in an unsafe way (ie. not just tripping the circuit breaker).
If you just add a lot of extra outlets and plug lots of stuff in then you will simply trip the circuit breaker. (Assuming that everything is properly set up according to code.) In order to create a problem you need some extra wiring that is rated for less load than the wall wiring. (Now in practice every splitter has some amount of wiring, so these can be the same device, but most power bars are rated to be "fully used" or have a fuse internally). So the problem looks something like this:
Now you are overloading the extension cord and risking fire.