Thanks for your input Ken and Mack.
I agree that setting up a new printer with Piezography inks is a good way to avoid color staining and wasting Piezography inks to purge color staining, and generally new printers work well.
BUT, if there's a problem, the printer is an additional factor when troubleshooting the issue, though wouldn't be a factor if it was known to be working well with OEM inks/carts. Occasionally a new printer is DOA, or doesn't work as it should somehow, and if third party inks/carts are installed first, it's not as easy to troubleshoot the issue, then if OEM inks are installed to test the printer, some may argue the carts/inks could have caused the issue. So, we recommend testing a printer with OEM inks before installing any third party ink/cart, to have a solid starting base. We provide helpful information based on our experience, but certainly the choice is yours.
I hope this helps clarify why we recommend testing a printer with OEM inks.
Please let me know if you have further questions, or there's anything else I can help you with.
Best regards and happy printing~ Dana