my experience is perhaps more "extended is required"
essentially - if the stove/cooktop is x" wide, most kitchen designers / home builders do an x" wide hood.
venting, non-venting, no matter.
30" "hole" for stove/oven, 30" wide hood.
does not do what one would wish it to do.
however what actually does matter is that the hood extends beyond the width and depth of the stove/cooktop - by at least 12 inches.
the fumes/vapors/oil mist escape an "exact width" hood - you get a non-solution to the problem.
get a gander at the sizing of commercial hoods - they work; the home center "kitchen designer" has those credentials only because they've mastered the CAD software, not be cause they know what they are doing.
fwiw, noting that for your own home, one needs absolute control over the kitchen design/build.....
and that gets real tricky.