The original lightweight MTB rims were narrow road rims rolled down to 26". Bontrager did it first using Mavic MA-40s, then Trek sold hundreds of thousands of upper end MTBs with their Matrix ISO aero rim. There is no real tire and rim fit issue with big tires on narrow rims.

You may have handling issues, but that really isn't the basis for the chart that Diabloscot that comes from the ETRTO and is designed for industry standardization.