A coolant vac is almost mandatory these days with some of the cooling systems they have today, if you don't want to spend a bunch of time bleeding the system IMO
Yeah, try filling a cooling system on a 3.6L Pentastar Grand Cherokee or Wrangler. I know it has the bleed valve, but no matter what you're still gonna get an air pocket in the heater core and have a sloshing noise in the dash on initial throttle tip-in. Sometimes they come that way from the factory!
I've had to put the nose of the car almost 45 degrees in the air and stab the throttle for twenty minutes just to get all the air out. Makes no sense to me either, since the core is below both the radiator fill neck and the bleed valve, and the tubing is pretty streamlined.