Inviting only people who support and agree with you to a meeting seems like a great way to run a company.

It depends on what the meeting is. There are situations where you might not agree with decisions being made, but undermining your superior infront of business partners is not ok.

Those are the kinds of problems you handle privately. Not in a meeting with other people from other companies.

Yep and now you are committed to something you didn’t want to be committed to because you couldn’t say anything in the meeting.