Nim is also not the only language with the combination of optional GC and memory management. Dlang and Vlang are two others, where the GC is optional and are compiled languages. Golang appears to be more seriously experimenting with various forms of manual memory management, so at some point, we might see it offer a choice of memory management options too. In fact, Dlang even has an experimental borrow checker.
Care should be taken to not be in so much of a bubble, to not realize that other languages have viable solutions too or are developing alternatives to what's presently available. If our choice for one or the other, is more a matter of personal preference, it would arguably be better to acknowledge such.