“No need to ever change the gear oil or ATF in a manual transmission.”
Maybe this applied to older American cars.
Lots of Corolla/Matrix owners who have had their transmission fail prematurely due to oil contaminated with metal particles would disagree.
I changed the oil in my Matrix at 22k miles after reading that its C59 transmission was problematic; and the oil looked pretty “dirty” and felt gritty.
My older Hondas ('75 Civic, '81, '85, '88 Accords) all recommended 30k oil changes.
Oil is cheaper than transmissions.