Thank you for your reply.
I get it. It's the chicken and egg situation.
I do not exactly know which libraries and frameworks the SA plugs rely on, but sometimes the porting itself isn't such a big deal: Steinberg has a Linux VST SDK since 2017 and this is the reason more and more AAA plugins are finding it's way to Linux. Sometimes it's actually the social and support component that scare developers away.
This is the way u-he handles this:
Please be aware the Linux versions of our plug-ins are still considered beta. While the plug-ins are stable, we are not able to provide the same level of support for these products as we do for the macOS and Windows versions. Support is provided via the Linux and u-he communities on our forum.
If there are indeed platform specific libraries and frameworks involved, never mind.