It could also be a difference that in times past most fishermen needed to justify their time (and expense) fishing by bringing home something to eat. Of course, these were times when we couldn't so easily just take a selfie pic proving what we caught.
When I was a child, we kept everything we caught. As a teenager & young man, I began releasing as many or more than I kept. Today, I don't fish as much, but do keep a few to eat, something I justify (at least in my small mind) simply by the fact I fish & catch a fraction what I did as a child & young man.
When I was a teenager & young man, there were countless days I caught a limit of 10 bass by mid-morning, and kept them all. I generally used heavy tackle (for bass) and big lures. Those 10 would commonly weigh in @ 35 lbs. I took out a lot of fish then.
Ironically, I did this without any the modern electronics. I just learned from my mentors, learned on my own, and fished hard & effectively. I still don't use any electronics when fishing by myself. May start fishing more in the future, may or may not keep or release more fish. Last year I kept enough bass for a couple meals, released the rest.
But a bigger point I'm trying to make is that there may be fewer bass, crappie, bream, and catfish being kept to eat today than decades ago. Not even sure the collective fishermen catch more today, despite those ever-becoming-better electronics.
Sometimes we worry too much about things that may not matter so much.