Why? If I was writing this I would write it for my OS.

Why would I write it for anything else?

I assume that’s what the author did.

do you mean they should've spent more time writing for other platforms or do you insinuate that they should've shipped a chromium browser instead of writing native software?

Is it?

I'm observing the largest tech companies in the world release macOS/iOS-first or only, and consequently supports said version the best in this era.

You've curiously left out which platform it's not weird to write software for.

Is there only one platform that's not weird, or is MacOS the only weird platform?

Some of the best platforms and software are weird. Get over it.

The unstoppable "rewrite it in Swift!" vs the insurmountable "where's the Windows version?"