Web-dev I mostly take it back (well this is subtle: for complex server side dev scenario you will use Linux even in dev -- but even with that enough work remain possible under purely Mac Os to not say that web-dev broadly can't be done)
But embedded: where are the most used tools for FPGA? where are the compilers for microcontrollers? Of course you can do some, in a limited capacity, with a subset of targets and a subset of toolchains, not the most used on earth. But broadly in that area, yeah you don't use Mac Os.
There aren’t that many tools that are on Linux but not macOS. You’re probably right for FPGAs (which I tend to consider a small subset of embedded, but of course there are different points of view), but the standard tooling for embedded platforms is there on MacOS, including some of the IDEs (I am not going to say most, because I am sure there are counter-examples).
But embedded: where are the most used tools for FPGA? where are the compilers for microcontrollers? Of course you can do some, in a limited capacity, with a subset of targets and a subset of toolchains, not the most used on earth. But broadly in that area, yeah you don't use Mac Os.