It's particularly galling how Outlook invites *by default* include a Teams link. You can disable this on a per invite basis or in your settings, but it's pretty icky behaviour.
New meetings created in Teams do include a Teams link - but isn't that what you would expect?
I like the auto Teams link because it saves me a click when setting up every meeting (and pretty much 99% of my meetings are Teams meetings).
I think this is a case where it makes sense to default on because most people will leave it defaulted on.