Good article.
Basically, with video conferencing software, you can either have ease of use or high security, not both. Zoom is the "ease of use" option, not the "high security" option.
Zoom just works, and functions well. However there are concerns about how secure it might be. It looks like the encryption could be broken by someone who was determined to spy on your particular conversation - so it is a bad choice for sensitive conversations where people will have a motive to invest the time into cracking the encryption. For instance, governments shouldn't be using it, as other governments have plenty of motive and resources to crack the encryption and hear the conversations. But plenty of governments are using it... The point there being that there are far more interesting conversations for someone to spy on than our own!
For general chats, it should be fine. There is simply so much bulk of general chatter on it, that it's highly unlikely anyone's going to go to the enormous effort to figure out which conversation is us, set up a man-in-the-middle attack to obtain the raw datastream, then decrypt it, simply in order to find out IF we were saying anything that might have been worth all their efforts.
Also, for the sort of discussions that we'd generally have on the public forum anyway, again it's fine. If we're happy for anyone in the internet to read our opinions, we're surely happy for some hacker to hear them also. He might learn about Christ from eavesdropping! If we were doing a "public lecture" sort of conversation, again this is fine on the same basis.
But for specific discussions on personal situations, or particular issues of borderline legality (e.g. marriage in circumstances that are legal in the jurisdiction of some participants to the conversation, but illegal in others), this probably isn't the best option.
I'd prefer a more secure option for everything of course, but ease of use is actually more important if we're trying to communicate, because many people we'd want to talk to are not that tech-savvy.