My point was that there is a meaningful, and I believe relatively simple, distinction to be made between free functions and methods bound to an object - a distinction which UFCS doesn't really help with. For any given example, I believe there is a reason to prefer one over the other, and I showed what reasoning I would use for the particular example raised by OP.
Although I rarely see Objects used this way. Often, methods are used to implement all related functionality. Unity even strongly encourages this. (...at the moment. They are working on Entity Component Systems which will work more similar to my third example)
I concede that languages shouldn't use the dot as a syntactic tool, be it through Extensions[1] or UFCS, but rather offer a pipe-operator. If they don't, I'd still prefer UFCS rather than no way of chaining at all.
[1] Extensions for interface/protocol conformance are fine of course.
