Yes you're right and they mentioned this in the shop when I spoke to them about all my requirements but they seemed to mentioned fixed and macro lenses at reasonable prices. Thanks for picking up on this!
For 1-1 reproduction macro lenses are the best option. however the difference between the results from them and even a modern standard zooms are hard to see these days. As I said in my first post, Quality to day is universally high. As for distortion to a very large extent residual Chromatic, Pincushion and barrel distortion, are removed in the cameras firmware. these are not things you need to worry about.
As a "beginner" people are expecting you to think about flying before you can even crawl. "Experts" use every one of the cameras and lenses that we have each suggested, with pretty much indistinguishable results. so do not be advised by knockers.
Photography is about far more than the cameras we use, it is mostly about knowing what we are doing well enough not to have to think about it, the real effort is devoted to seeing, lighting and making visual choices.
People tend to form views about cameras based on their own personal difficulties, which can lead to giving bad advice.
I find professional DSLRS tend to be to big, too heavy and unnecessarily complex for me today. But were I a sports Photographer that is exactly what I would be using. Mirrorless have not quite got up to speed in that area yet, but they are not far off ( some specialists swear by them and have made the change)
Interior Photograph is particularly straight forward to a camera and, it kept me and my family fed for a number of years. As someone mentioned, you can always do a pan if you do not have wide enough lens. I posted a thread recently about some examples of how to overcome some common distortion issues with interior stitched pans. ( this also applies to exterior pans)
https://www.talkphotography.co.uk/threads/panoramic-projections-and-distortion.671751/
In terms of cameras, we tend to like those that have the right feel, where buttons are well placed for our hands and muscle memory, and that have easy to suss out and remember menu systems." Hands on " experience is probably the best way to choose between two equally technically proficient cameras.
When we complain about image quality it is very rarely the fault of the camera. It can sometime be a software issue that has not been resolved, but almost always soon is, but usually it is because we have been unable to master some aspect of handling or processing. In those circumstances we do not like to blame ourselves, so we hunt online for other examples of similar failings to justify our opinions.
We will always find something or someone to back us up... If we look further... we will also find even more examples of other people who have no such problems, and who produce excellent work on that self same camera or lens. "workmen blaming their tools" comes to mind.
What is certain, is that somewhere down the line we are all going to end up using mirrorless cameras. There is nothing inherently "Better" or more "Professional" in the DSLR design. However it has probably reached a peak in its development, that in most areas, have already been surpassed by some Mirrorless or other.
The best camera for the task is the one you have with you.... in your case size and weight will matter for your work in the hills. For interior and studio work the bigger the better is the rule. Compromise is most certainly the best solution. An APS Mirrorless could be that answer.