@MikeKovacik4928
I have been using Inventor for nearly 10 years now at 3 different companies. In that time, Vault has pretty much been there along its side. My first company I was using Vault workgroup for the life cycles and revision control. In my last 2 companies it has been Vault basic. My last company brought me in to get the 3D modeling started and shown to other engineers. I implemented Basic since it came free with Inventor. The problem I had was not in the Vault software, but rather co-workers. Because they had no training and I did, as much as I tried convincing them it was a necessary tool for the job, they insisted it was more of a pain then a useful tool. This went down to the IT guy as well, but he was just speaking from a pure management and installation perspective. I am currently in the process of getting our basic Vault upgraded to workgroup because of the additional benefits of auto part numbering, revision control and life cycles.
I am the only one using Vault in my current position basically because I am the only one in engineering. For the moment. Yes, it does slow things down a tad, but that is not necessarily a bad thing, because to me Vault is useful in managing all of the Inventor data, keeps appropriate files linked, and allows me to use copy design when needed.
At my last job, management decided to eliminate Vault. So, for the last 6 months I was there, my copy design turned into a lengthy process of copying said files in windows explorer. Calling up the assemblies in Inventor and reattaching them when prompted. So, when it is stated that Vault slows things down? I can tell you first hand, Windows explorer is a lot slower process.
Even though I am a single user at the moment, I still find it better to use Vault.
To the point that @CGBenner brought up in a multiuser environment, that was my first job. while most of us were in our own specific projects, there was occasions where someone else had a part/assembly I needed checked out. Vault is great at managing situations like this and eliminating duplicate copies of the same named parts/assemblies.
Makes searches (which is another great internal tool of Vault) that much cleaner and easier.
I hope this helps.

Windows 10 x64 -16GB Ram
Intel i7-6700 @ 3.41ghz
nVidia GTS 250 - 1 GB
Inventor Pro 2021
Best Regards,
Scott McFadden
(Colossians 3:23-25)