I've been told for 35 years I need to convert my 27" bike to 700C. I've been told for 15 years I need to convert my 26x1 3/8 bike to 650B.
Yeah, I haven't taken that advice. No problem finding quality tires for either and they still offer a lot of miles and smiles.
Now I'm told I need to send my 26" (ISO559) bike to the landfill and get a tubeless 29er.