There are good reasons to make all communication, even trivial conversations, secure.
If we only secure "important" communications then we are unnecessarily broadcasting useful meta information to prospective attackers. Encrypted communications rise to the foreground in visibility and that gives away who and when and where sensitive information is shared.
OTOH, if we secure all communication then we make the work of attackers or over-reaching governments much more difficult because no communication clearly says "high value sensitive information"
There are good reasons to make all communication, even trivial conversations, secure.
If we only secure "important" communications then we are unnecessarily broadcasting useful meta information to prospective attackers. Encrypted communications rise to the foreground in visibility and that gives away who and when and where sensitive information is shared.
OTOH, if we secure all communication then we make the work of attackers or over-reaching governments much more difficult because no communication clearly says "high value sensitive information"