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When a lower f/ratio were better than a high one, regardless of the absolute aperture, as some claim, then we all use iPhones / Galaxies or other Android phones to do AP, as these are usually a 'bright' f/1.8... f/2/2. And for regular photography as well and the DSLR market would be dead and all reporter and professionals use lightweight phonecams.
And there were no EELT or JWST or other monster telescopes in use.
I can see it when I do AP with my Canon 70-300L (f/5.6) which has 55mm aperture and with my ED110. First is 300mm f/5.6 and the latter 600mm f/5.6.
See the difference that the latter shows more detail and fainter stars with the same f/5.6.
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