Of course, the real cost-saving is in labour—web development presents a radically lower barrier to entry compared to even non-native, cross-platform UI/UX platforms such as Qt, or Flutter, or what-have-you, let alone simply managing multiple native applications.
So this is not a bill-of-materials kind of analogy, it's a statement about talent.
Web leaders have grown complacent; at times, it seems they don't take things seriously. I mean, just take a look at something like SvelteKit. I'm not a web developer, however I happen to like Svelte a lot, but also despise SvelteKit equally as much.
Every major release is like "fuck you."
Using Electron to package your application often saves time over writing a native app.
Giving a regular user a ready-to-use app saves them time, because they aren't googling "how to use terminal" for five minutes or trying to copy-paste the magic command out of their notepad app.
Under some circumstances; arguably, in only a handful of circumstances. The colloquial 10xer may as well as get the job done at a fraction of the labour cost associated with a 10-man senior (but really, comparatively junior) team, whereas the latter would spend months rewriting, refactoring, troubleshooting, triaging, bug-hunting, what-have-you...
Much can be said about inefficiencies of engineering teams.
Mass is a nonsense analogy that doesn't reveal anything useful.