IMO, states should get rid of blanket rules for their entire state, and let those decisions be made at the county or city level. A state like TX or CA is extremely diverse from county to county with respect to their population density, economy, etc. Rules that may make sense in one county are downright silly for another county.
Plus, when the rules get pushed down to the local level, those making the rules are held to account more from their constituents, so it reduces the amount of arbitrariness in the rules. If a county commissioner is worried about arbitrary rules ruining their chance of re-election, they are much more careful. And that's a good thing.
The Feds are worried that the states that completely re-open will show similar stats than the closed states, and that will put more pressure on the Feds to butt out. It's hard to fully appreciate just how much the feds love making rules and telling everyone how they should live. After all, they went to an Ivy League school and know what's best for you.