Anyone know why the Space Force decided not to include the Warrant Officer ranks, other than it’s somewhat of an outgrowth of the USAF?

There aren't enough highly trained spaceship repair personnel to have 'expert' yet. Give it a few years for experience to determine exactly where warrant officers will be needed.

There's the canned history about WOs and what niches they've filled. Other than initial politicking to get the Army warrants in the coastal artillery, there is an overall force structure aspect that almost never gets print. When you need a overall skill, capability, authority, etc. mix and you only have enlisted and commissioned officer, you can easily create constipation in the promotion flows on the commissioned side and early capping on the enlisted side. If you pull a bunch and put them in a separate category with promotion flow, you can fix the problem. Everyone knows what stagnant promotion opportunity has on morale and the desire to hang around I'd expect to see WOs at some point in the SF if we see the structural demand for it. That remains to be seen and then figured out.

I was really hoping for a master chief in the Space Force.