I was so frugal that I didn't refinance my (admittedly already low) interest rate during Covid because "we were planning on selling the house in a year or so". Oh well :)

Thats more of a forecasting thing than frugality.

No that can be a frugality mindset of not wanting to pay the refinancing closing costs (which can be 5 figures) .. I've seen family make similar sorts of short term savings vs long term savings trade-offs.