(edit: a few additions and clarifications)
The A1 has +/-2 stops of exposure compensation which is why most people would change the film speed. That was enough to address most situations I encountered after I learned to read the scene and decide if I needed to address backlighting or shadows when using automatic exposure. The compensation was on the external film speed dial but I could change it while looking through the lens to monitor the exposure meter, albiet a bit awkward.
Since there was no exposure simulation (unless you wanted to do stopped down metering), this was something you did from experience, just as we did with aperture and shutter speed using rules like Sunny 16, Looney 11, and other photography rules when shooting manual (which was my normal mode as I gained experience). Rather than exposure compensation, I might just change the aperture or shutter depending on what I was trying to prioritize. My Nikon School Handbook was a useful reference and always in my bag. Still is on some occassions. (I went through Nilkon School with my A1)
I wasn't into push processing and did not develop my own film, so I chose to set film speed correctly when I loaded the film and didn't change it. I chose film for the conditions before I started a shoot and carried some film alternatives so I could switch between ASA/ISO, film/slide, or color/mono if I wanted. The latter two occurred more often - there was no camera setting for that with film cameras.
When I went out to shoot, I was usually going through a couple of rolls and I would finish them off so I could start the next shoot with fresh film. I never took just one image, it was usually 3 to 5 at a time so I went through film pretty quick. The cost of the some unexposed film didn't bother me if I had to switch. I digitized several hundred rolls of film/slides quite a while ago.
My workflow adapted to digital quite nicely and now I have all of the flexibility in camera or post processing. Today, I'm always in Fv mode, setting aperture, shutter, and ISO manually. It is wonderful to have exposure simulation.
My granddaughter was in a recent middle school play. I went the first night to dial in the settings and lenses that I used the second night - R6/R8, RF85 f/2, RF 28-70 f/2.8. I also identified the key things that I wanted to shoot and where would be best to shoot from in the audience based on the lighting and lines of sight (they tended to face towards the left, I was right of center the first night). All I had to do was shoot, very little post processing because the exposure and white balance was consistent across all photos. I didn't have to adjust each photo individually. Autoexposure can be your enemy in these types of situations. I published the best 150 of 1800 images taken for my granddaughter to share with the cast, crew, and director. Parents were amazed by the difference between my photos and their cell phone pics.
R8, RF 85 f/2, 1/250sec, ISO 2500, DxO PL8 - +30 shadows/midtones, -30 highlights, vignetting, sharpness and NR.
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