I've been using Zoom recently but for chats with friends that aren't sensitive. I gather they have improved security somewhat, but when I hear "talks with clients" in the context of something with potential security issues I wonder if it's suitable. Of course not all discussions with clients need to be confidential, depending on the business.
The funny thing is that some of the friends live abroad and I never used Zoom to talk with them until we were all locked down, even though it would have been ideal for the job.
A friend of mine is a social worker who deals with foster children and apparently she has something (I don't know what) that lets kids talk to therapists over a video link that is sufficiently secure to not generate privacy issues. From what she said it sounds like it's approved under the legislation that protects health data, so it must be good.