Howso?
Two users can share many different separate personal message topics, whereas chat is literal ephemera - by default messages over 90 days old are purged.
They’re two very different mechanisms.
Think of one as email and the other as SMS. It’s far easier to locate an email on a particular topic, than it is to scroll back through thousands of messages hunting for a particular conversation.
If you never want or need to refer back to older conversations then don’t instigate PMs, but please also recognize that others could very well see value from the functionality afforded by the more structured and persistent messages function.
Why? New messages in either feature show notifications, and if you’re looking back for something you’ve previously read personal messages are already searchable:
