Originally Posted by itat
The PEX in your unit is 1/2" so the larger hose still feeds into the smaller diameter water lines before it gets to any faucets.
And as long as you only used one faucet, the larger supply hose would not make a difference.
It's when you open two or more faucets that the larger supply line helps
and then, really only on the cold side as the 1/2" pex is usually pretty short from the city hook-up before it branches out to the various plumbing runs.
Of course, all this depends on at least 5/8" diameter (or >) supply at the pedestal/water bib.
EDIT: Pressure (for me) is WAY more important than supply hose diameter.