You are mixing two distinct issues there: pace of game (popular change) and earlier game times (club-dependent and not a universally popular change).
Of course the pitch clock has been well-documented as an overwhelmingly positive change.
Earlier game times, on the other hand, are not so popular and, more significantly, do not appear to move the needle on viewership. Indeed, the teams that have 7:00 PM local game times on weeknights are all in the very biggest markets: Mets, Yankees, Dodgers, Blue Jays, Astros, Rangers, Braves — these teams are all in located in the 10 largest metropolitan areas in North America.
Rather, game times appear mostly to be set based on attendance concerns. Examples: the Red Sox and the Cubs start weeknight games earlier in April and September, and at normal times in the warmer months. And of course lots of clubs have earlier starts on M-Th nights but not Friday.