Late '70, early '80.
That is:
when proper multicoating and computer-designed lenses were available;
when it was still possible to buy proper mechanical cameras;
when light meters were already SBD or GASP, fast and reliable (knowing how to use them);
when if you needed one you could still buy cameras with an interchangeable viewfinder, and there was also one with interchangeable backs.
when the choice was still quite ample;
But:
before autofocus (more fragile, energy hungry);
before motorised film advance and rewind (possibly fragile, energy hungry, noisy);
before matrix metering (never understood how can one possibly desire to bet on the "right" decision made by the camera in a difficult situation).
before cameras with a plethora of minuscule push-buttons and a thick user manual.
Slowly but surely, autofocus was all over (the change in focusing screens made focusing by hand difficult and AF become the only real way to operate), manual rewind became expensive, lenses become having plastic bayonets and possibly an excess of plastic parts, all the motors everywhere made the cameras more fragile.
When you need AF it is certainly a progress. But for normal operation I greatly prefer a good old manual focusing camera, easier to focus and more reliable (or less unreliable) in evaluating DoF.