Why not a standalone bill for Medicaid block grants?

The way I see it the AHCA was trying to do two things at once. The first thing was trying to unfrick the insurance markets, and I think it's clear by now that isn't going to be possible without 60 Senate seats or cooperation with the Dems (writing it to fit it through reconciliation only makes things worse).

The second thing was to try and dent the long-term costs of Medicaid by block granting it to the states. Now as far as I know this part was popular with Republicans all over the spectrum, and it's definitely something that can be punched through with reconciliation.

So why wouldn't Ryan at least go for half a loaf here with one of his pet policies? Wonks pls a splain