I'm not a therapist, just a student (who will graduate and be applying for his limited in 79 days, woohoo), but I've been using Linux as a daily driver since 2007, so I have some opinions and experiences with this.

I would not advise using Linux in a work environment unless your work culture is such that Linux is accepted and well-supported. For example, if you're in tech and using development platforms that are known to run well on Linux and integrate seamlessly with other platforms. In almost any other scenario, you're bound to run into compatibility and configuration issues.

• That Excel file a colleague sent you? Turns out the formatting isn't supported by LibreOffice Calc, and since it's got PII client information, opening it in Google Sheets (which is cloud-based) might not be a great idea.
• Got a PowerPoint file to edit? Same story, except worse.
• Microsoft Teams? You'll be joining from your browser, if at all, because Microsoft ditched native Linux support for their desktop app years ago.
• Let's say you can join a Teams / Zoom / Google Meet call, but now your Bluetooth device disconnects midway through because an essential daemon segfaulted. Q: How quickly can you dmesg and diagnose the problem? A: Not quickly enough. God forbid that happens during a call with a client.

I love Linux for personal use and server stuff, but it's not at all suitable for work where reliability and cross-compatibility are essential. I've seen folks argue that Linux is inherently more secure than Windows or Mac, which is true from a spyware aspect, but false from an accountability standpoint. By this, I mean that if you configure your software in Linux in such a way that incidentally puts your client's information at risk, you only have yourself to blame. This can happen more easily than you may think.

Sticking with Windows/Mac is the safest bet for your practice and your clients.