Kessinger is a good example how player evaluation has changed since sabermetrics.
Probably through the 1980s, a player like Kessinger--good defensive SS but can't hit a lick--could be an everyday regular for 10 years or more in the big leagues. Basically, Kessinger was Munenori Kawasaki.
Kessinger had 8.9 rWAR total in 16 seasons (7.9 fWAR). Remember him well when Cubs came to Dodger Stadium. Durocher batted him leadoff.
Game really changed when offense became a part of what a SS is supposed to do too. Kawasaki's peers are a lot different than Kessinger's peers. But, think modern statistical evaluation has played a big part too in the role players like this have in the big leagues.