To take the old kickoff format and say "we had a good thing going" is kinda not accurate. It was nothing but an endless string of touchbacks - hence the rule change (which doesn't seem to be working).
Let us not act as though kickoffs last year was edge-of-your-seat excitement. It was just as boring as this year's kickoffs.
I'd counter that, while it wasn't edge-of-your-seat excitement, day in and day out, you could count on seeing guys like Devin Hester, Dante Hall, or Josh Cribbs providing some exciting moments.
Of the 30 players all-time who have score 4+ TDs on kickoff returns, 17 of them played in the 2000s, and 10 of those into the 2010s. There's a really sharp drop off in outstanding KO return talent after 2016. The all-time leader, Cordarelle Patterson scored five of his nine during and prior to the 2016 season.
What's wild is that, prior to this sentence, I hadn't researched exactly when the kickoff rules were being tampered with, but as it turns out, 2016 was the year that the touchback line was moved to the 25.
From 1994 to 2010 (the year prior to moving the kickoff to the 35 yard line), there was never less an 87 yard per game average for kickoff returns. Since then, the highest average is from 2013 (64.2 yards a game). Since 2016, the highest is 44.9 yards a game. That's about half the return yards as prior to the tampering.
Seasonal kickoff TD return leaders from 1994-2010 had at least two touchdowns in a given season. Since 2016, only two players have surpassed more than 1 in a season.
People may not have like them for whatever reason, but statistically, kickoffs were more exciting before.