In our organisation, some myApps users on Linux Desktops use myApps Softphone within the browser. For them, a VDI solution would not help, leaving the "real" Linux myApps Client as a more helpful solution. However, the only really missing feature from the browser version is that there is no way to support tel: or phone:-Links, as this would not have installed an XDG MimeType compatible URI-scheme handler for those two schemes.

Maybe more helpful than such a fully-fledged myApps Linux client would be, for example, a simple companion tool/script that could initiate or end calls, that could be registered with a MimeType x-scheme-handler within the Linux desktop, or that could be configured to be used with keyboard shortcuts or headset buttons. I don't know much about web technologies, but maybe there is a way to realise stuff like that with a browser extension or having the browser-based softphone in PWA form. (See https://developer.chrome.com/docs/web-platform/best-practices/url-protocol-handler for inspiration).

Of course, there may be use cases for a myApps Linux client that would not address this. However, from experience, many Linux users usually prefer simple solutions that have a chance to work reliably in the long term and allow adjustments rather than having a feature-rich, hard-maintainable solution.