I mean, batting average isn't that great as is w/current kid gloves. Gotta risk a little to gain a lot here (plus it's morally warranted). We know holding budget bills hostage always get resolved and neither Sinema nor Manchin have the stomach for those fights imo.
I dont see what incentive Sinema or Manchin have to support standalone progressive bills, it doesn't align with their personal politics or help them in their respective states.