If you are doing any to the counter cabinets, she's right. The top alignement height will be off if you have tall cabinets also. If you aren't doing any tall cabinets and to the counter cabinets, then the overall height should be fine. The other issue will be that the cabinets will need a complete solid plywood subtop to support the counters if you do not want to put a plywood subtop on them. That's probably a decent upcharge. Usually, the top of cabinets are not solid. They just have corner braces. So, to install 2 cm counter, a subtop of plywood is applied. That top will show with 2 cm, as it rests on top of the cabinets. So that's why 2 cm is traditionally laminated at the edge. You could also do a stainless steel trim piece, or a cabinet trim piece to hide the plywood. Your KD would actually have to open the spec book and see what trims can work with what size plywood. You might have to use 3/4" ply, as many trims are 3/4". But, I'd also have to open my spec book to see if any could work with 1/2" ply. As far as your range goes, it will sit slightly higher with 2 cm tops than 3cm or 4cm laminated ones, but it's not that big of a deal if it's a free standing or a pro style range. It is a bigger deal with a slide in range, as those have a limited amount of adjustability and unfinished sides.

I live in California. Most granite/marble/quartz here is 2cm although 3cm can be found. Cabinets have to be level no matter what. I have Caesarstone on my perimeter counters that are 3cm with no laminated edge. My island is 2cm marble with a mitered edge that doubled it to 4cm. My butcherblock counter is about 1 1/2" thick (a little less than 4cm). So all counters are a different thickness and I don't even notice the difference in thicknesses. I think the thinner edge is slightly more contemporary looking, but it's really up to what you like. Plywood with metal supports on the island before the marble was installed: 3cm Caesarstone (Arctic White), 2cm marble, 1.5" butcherblock:

Here's a pic of both slabs together. Flwrs--How funny that you mention Theanimala's kitchen as I just posted about her kitchen today to someone asking about horizontal pulls. I love her kitchen! Have you seen Alabamamommy's marble island? Big and thick too! Hermajesty--I guess my BA love won't be fulfilled IRL. I'll have to "visit" your kitchen to get a fix! Wait, you just gave me an idea. I could use it in one of my bathrooms! I'm not sure it would work in the new master, but we'll reno the kids' hall bath next year and maybe I could use BA in there! I just love it so. Rhome--I think I forgot to tell you about my marble outing! I like a simple counter edge better myself too. The meyer lemon incident could happen in our kitchen too in a handfull of years. For now, I'm pretty much in control of the cooking and marble etching. Maybe by the time DS and DD can cook, it'll be etched enough by me. (I say this crossing my fingers and wishing!) Rachel--Another BA owner chimes in! I love your counters too. Maybe we'll have opposite twin houses. I'll have kitchen carrara and bath BA to your kitchen BA and bath carrara. I love touching the marble too. Feels sooooo luxurious and smooth. Babs--thanks! I think we may finally, actually, impossibly, really getting started soon! I've been planning this for over a year now!

With a mitered edge, the line tends to be hidden on the corner transition. Some of the quartzites are pretty expensive so the 3 cm might cost significantly more (though the fabricator will charge something for the labor of making a laminated edge and probably even more for a mitered edge so that offsets the extra cost of 3 cm unless you go for a 2 cm edge). Our quartzite is laminated, not mitered and the fabricator did a good job so I mostly don't notice the line. Only when I look for it. You don't need to do a laminated edge even if there is plywood under it. Two friends of mine did a 2 cm thin edge. One used a simple trim molding of wood matched to the cabinets to cover the edge of the plywood. The other left the plywood edge uncovered - I know because I put my head under the counter and looked into the shadow for it. If I was doing it, I'd probably cover with a trim piece because it would bother me, but only someone very TKO who looks for it would notice if you didn't.