A contrasting floor is the standard when it comes to white cabinetry, however if you are not a fan of it and you like the mid tone floors to match your existing furniture then my advice is always to listen to you. You are the one who is living in your home,and you are the most important piece!

Can you show pictures of your dining room floor and furniture? That will help you get the best answer.

I can't imagine why a dark wood floor wouldn't work with mahogany furniture.

IMO all floors in a home should match. What is the DR floor? I have white cabinets in the kitchen, cherry furniture in the DR and my floors are white oak, natural no stain.

I would generally say that the floors in the kitchen should be the same wood as the dining room floors.

I can not imagine why your designer would think white cabinets do not work well with medium stain wood floors. The stark contrast is with dark stained wood floors. I would definitely do the medium stain you want.

Post a picture of your DR floor . There is no reason I can think of that would keep you from having a white kitchen with really any color floor, you just need the right white . I am only really guessing without seeing the floor in the rest of the house but IMO all the floors should be the same throughout the main living space and whilte will go with all of them.

I have water popped provincial on hickory and consider it a medium-colored floor with BM White Dove cabs.

I have a white kitchen with natural oak color floor ( pretty light). It looks great!

I have light birch wood floors and a white island. I love that combo!

Look at this picture, does this look wrong?

I see lighter floors similar to luckyblueeyes most frequently in new design pics:

A little darker:

My sister in law has dark wood floors like the picture leelee posted. I like the contrast but the dark wood shows everything.

Light or natural coloured hardwoods are often used in contemporary design (think Scandinavian Modern or West Coast Modern) as well as transitional design (wood is often used in transitional design to offer warmth and a sense of "home" to a space that is a snick more modern than most would feel comfortable in).

Personally I would leave the colour alone. You want your mahogany furniture to be happy and right now the colour you have is doing it's job. Why mess with a good thing? A medium or light wood floor with a "white on white" kitchen is STUNNING!

Kindly remind your designer you like what you have and would like to preserve it. That should be enough to ensure your wishes are maintained in the design discussion with your designer.