They may decide there is nothing to fix. If you want to use a password you can.. but don't force it on the average user who would trade having no password with the potential of someone random joining.
If you want to keep it private use a password.
Generating a random 6-digit passcode for each meeting by default? Not hard at all.
Rate-limiting incorrect password attempts could take a bit longer to implement, but still not a particularly difficult problem to solve.
I never understood "presenter will let you in" security. It's based on someone letting me in if they recognize my recorded name and that I work there? Surely that wont backfire in a world where everyone post every detail about every day of their life online. I mean who even uses LinkedIn anyway?
You can also require users to be authenticated (through SSO or other mechanism) before they log in, which could defeat some impersonation attempts.
Not hard, everyone needs to password-protect their meetings.