Both the technology of the 1990s and the 1960s are now obsolete. The fanciest Western tanks are being taken out by drones if they don’t have cages.
And even then, the cages are being overwhelmed by drone swarms and multiple hits.
The NATO tanks are more expensive, and have more frequent, expensive and complicated maintenance and repairs.
Even a T55 with a drone cage, decent optics, and a mine roller is a viable vehicle for shorter range HE indirect fire. which is supposedly what tanks are mostly used for now.
(and updated T55s don’t cost $24 million each , either)