Thank you all for your input. I am probably in line with Maris when it comes to the large format platinum process with 5x7 and 8x10 negatives. I really want to try to master a purely analogue approach with these negative sizes.
However, as I have gathered hundreds of small format negatives I will probably also create digital negatives and print a selection at 5x7.
If I eventually get to a point where my prints are good enough to sell I think I would feel obliged to make the distinction to prospective buyers.
That doesn't mean I'm right of course or that any differing opinions are wrong.