There were about 2,000 less strikeouts league wide than there was in 2019. Granted, there’s over 10k more per year now than there was 30 years ago.
Pitchers definitely throw harder and put a lot more spin on the ball than they used to—but they’re also a lot more fragile and don’t throw as many pitches.
I think you’d see change once teams stop giving huge contracts to pitchers—it would incentivize pitchers themselves to back down a little bit to stay healthier collectively. I think the long term trend will be to have a roster full of pitchers who still throw hard, but only pitch 2-3 innings per appearance. Starters will go the way of the dinosaur in another decade if things stay as they are IMO.