Earthen floor vs Tataki cold coints

Hello everyone,
I would like to ask your experience with traditional earthen floor. We have finished our rammed earth house, using lime as stabilizer. Now we would like to proceed with earthen indoor floors.
The intended layers will be following:
- Concrete foundation slab
- waterproofing
- floor insulation 12 cm (EPS)
- additional vapour barrier
- earthen floor 8 cm
It is clear to me that using lime to stabilize earthen floor (as they do in Japanese Tataki) would create cold joints between it's layers. That's why they create Tataki at one go as one layer only.
However, does the same occur when creating traditional earthen floors without stabilizer? Will there be any cold joints between it's three layers (base, cob, top) if I do not use any stabilizer?
Thank you for your feedback.

Welcome to permies, hopefully the right people will read this and respond, but since no one has responded yet I wanted to at least say welcome to you!

I'm very interested in your plan to pour a concrete floor and then put earthen floor on top of it. I'm in that situation because the concrete is already there, but after looking round here I notice that most people prefer not to have the slab. I'm also interested in the Tataki method - and just read about it. If you have links, I'd love to know more. I found a person in Japan, named Holzueter, who seems to know a lot.

I wish you well with your project.

Warmly,
Shodo