That’s true, but they’re not widely supported, so you can’t count on them to communicate. It’s also really hard to know for laypeople if the result is safe or not, so it’s dangerous to train them to accept encrypted ZIPs. Plus, as long as you don’t care about compatibility, you’re probably better off with encrypted disk images (DMGs or LUKS), because they don’t have completely dominant unsafe implementations.
The filesystem drivers in most linux distro's (and I'd argue Mac and Windows too) have never been under scrutiny for security bugs. I wouldn't trust an ext4 image I got from the internet unless it was signed and from a trusted source, that's worse than ZIP files.
What about a bare tar ball though?
Acceptable but tar's have their own set of issues (mostly efficiency and being tape oriented)