Are personality tests helpful?

There's been some conversation at work recently about the use of personality tests as a collaborative tool.

The idea is, if enough people take a personality test (Meyers-Briggs, Enneagrams, and True Colors were the ones that came up for us), then the results of that test can be used as a shorthand to describe how to best collaborate. ("Oh, she's a 3 and I'm a 7, which means we may not automatically see eye-to-eye here and here. We'll have to keep tabs on that as we work together.") It seems like a potentially great tool in a work environment.

Well, something about the conversation activated my obsessive compulsive spidey sense, because here I've been this weekend taking every test I can to understand who I am, why I act the way I do, and what I can do to become an even awesomer version of myself.

My current conundrum is my Enneagram number. I took the test a few months ago and again last night, with the same results each time (probably 6, perhaps 5 or 4) but my husband is convinced I'm a 4. I went down a rabbit hole of "6 or 4" forum posts and advice, and I still haven't figured it out.

I'm not sure what this says about me, but the longer it remains unsolved, the more distressed and obsessed I get! Ambiguity is for the birds, man.