It’s not 90 years ago though. Most reeds are relatively consistent within the box and box to box. Unless it’s your wish to work on them to create something unique to you, I believe you’re playing the wrong reed if you’re working every one in the box. The back always has to be flat. If you’re routinely taking material off both sides and making other regular adjustments on the scrape; you’re changing the cut and should find a different reed that suits you better to start with.
Of course but talking again about finer details here again. If a reed needs very minor work and some light sandpapering that’s usually fine. If it needs more than that you may be able to get it to being a playable practice reed but not performance/recording reed that you love playing on and love the sound. Jack from Boston sax shop said something along those lines.
I disagree with both of you. I have rarely found a reed that doesn’t benefit from a side to side balance adjustment. I do work on every reed. Usually 2-3 minutes at most. And then they all play just fine. I make no distinction between practice and performance reeds.
Of course I know what kind of reed works best for me (Rigotti, BSS, old Ricos), and what strength. So adjustments are minimal. But most every reed needs a little side to side balance - one side is harder, or stuffy, or unresponsive. A few swipes with sandpaper fixes it. I also flatten the back.
I agree reed consistency has improved in the last 2 or 3 decades. Computers are good for something after all.
Regarding the last 90 years comment, Stanley Drucker, ex-principal clarinet with the NY Philharmonic, tells a story about his experiences as a student in the 1930s. (Interview with Ed Joffe on YouTube, well worth looking up.) A box of Vandoren reeds came with no strength markings. One would be a 5, one would be a 3, and everything in between. It was expected of all players in those times that you would work on your reeds.
I studied with a great clarinetist as a teenager, in the 1960s. Reeds certainly came with strength markings then, but in my second or third lesson I was given instruction on reed adjustment. Which continued throughout my studies. But I see so many posts here where people expect that reeds be consistent and playable out of the box. Many cite the variability of cane as a reason to use those plastic abominations that go by the name of “synthetic reeds”.
I prefer authentic reeds; they sound and respond better. Learning to work on them is just part of being a woodwind player. Luckily it’s pretty easy, I was successful at it as a 12 year old kid.