This is definitely an interesting dialogue that we are having. It does make me ponder that I used a personal card for business expenses, but quite honestly, I’ve always done that. Even now, I use personal cards for reimbursable business expenses. Should I be doing that, I don’t know, but I’ve done that for decades without giving much thought to it.
I have never had an issue with any other card issuer, and have been with American Express for over 30 years and Chase for a little less than that. In fact, 25 to 30 years ago I used to put considerable spend on my diners club card. Also, without an issue. Back then you could go two billing periods before having to pay, and quite frequently I did so.
My business spending the last couple of years has been down considerably due to the pandemic, but will likely ramp back up eventually.