I would do the matte black with your counters. ORB can just as easily be out of style in 10 years. Regardless, the style you choose can also be outdated down the road. Handles can always be updated in 10-15 years anyway!

I agree with Patricia Colwell. Gee, you are choosing dark for everything. What is the color of the kitchen floors? I would use the opportunity of hardware to add some gleam and brightness to the dark oak and black counters. Though I do not agree with the rec for a stainless finish. I would have the hardware be polished chrome which has been around for a century. You also will have a much easier time finding polished chrome on door hardware and light fixtures.

I do not agree with the OP that every room in the house needs the same finishes. The door hardware should match on each floor, but that's it.

I'd consider an antique brass or pewter finish for the hardware to avoid the unrelieved dark look.

My new kitchen has dark brown Ikea Edserum cabinets with Formica's "Basalt Slate" countertops around the perimeter and a Carrara marble island, with brass knobs and cup pulls from Lee Valley. I can't imagine using ORB or matte black hardware on those cabinets -- there would be very little contrast.

I feel like whatever the hardware in the kitchen is, we must continue that color hardware throughout the rest of the house- the metal on the light fixtures, the door hardware, etc.

I agree with everyone else who says that you don't have to use the same finish throughout the rest of the house, though I do believe all of the light fixtures -- at least the ones that are visible to each other -- should somehow relate to each other, in style, shape, etc.

I wouldn't do stainless or chrome hardware unless you want the hardware to be the star of your kitchen. Something with that much contrast will be the first thing the eye focuses on every time. Antique brass or bronze might be a good look but it would help to see pictures of what you're actually working with.

If every single light, door handle, cabinet handle, hinge... is the same through the whole house, the look is static and the type of thing you'd see in production building. Mix it up a bit just as would have been done in a farmhouse that evolved over time.

What do you like?
What feels good in your hand every time you handle (heh-heh) it?

This recent blog post from a designer might be helpful,

https://laurelberninteriors.com/2018/07/22/best-door-knobs-sources/

I'd really like to know what she decided!

Rubber oil bronze is a bit more traditional (with hints of real metal coming through) while flat black is more contemporary. Either could look striking given the description of dark oak and black countrrtops it really becomes a preference.

The key decision in my mind would be, what are the switches and light fixtures (in that particular room specifically) ?

if your house has an open floorplan its also OK to do "zone" design meaning whats in the kitchen can have a contrasted finish from the livingroom.

a side note if going with lots of dark both in fixtures and cabinets (and/or appliances and sink) be sure to bring in light for contrast, either with lots of daylight (windows), flooring, upholstery or in the adjacent space so the eye can flow or pop.

Having multiple shades and texture of the same family can be beautiful but too mucb of a good thing can make it overwhelming.

best of luck.

What is the finish of the kitchen sink?