Any response to the fact that Kershaw faces more batters in a season than Trout has ABs? The defense certainly closes the gap to maybe even trout having more value but let's not act like this gap is large is a gap at all.
A team comes to the plate 6000-6300 times per regular season. A single batter like Trout can account for 10% of those PAs.
A team pitches ~1450 innings per regular season. A single pitcher like Kershaw pitches about 14% of those innings.
So if Kershaw pitches a higher percentage of his team's innings than Trout does his team's PAs, how can Trout be so much more valuable?
The first issue is that positions players play the field and run the bases. They add value in ways pitchers simply can't. That is the value that closes that 10% to 14% gap. It also tends to make hitters somewhat more valuable overall. Every in play out splits the credit between the pitcher and defense, and every defender is also a hitter.
The second issue is that Trout is, quite simply, one of the best players in history. He is better than Kershaw. If you exclude Trout from the conversation, pitchers put up about as many total 8+ WAR seasons as hitters do.
Going off topic a bit....
Now looking to the postseason, a team playing a 7 game series will have ~266 PAs while pitching ~63 innings. In that series, Trout can still only take ~10% of the PAs, but suddenly Kershaw can pitch 30%+ of the innings. So in the postseason, one single elite pitcher is closer to 2x more valuable than an elite position player. The limiting factor, obviously, is there is only room for a single elite pitcher to pitch in 3 games (1, 4, 7), so multiple elite pitchers have diminishing returns in a 7 game series. Your second best pitcher is only going to pitch in 2 games, which will limit his contributions to ~20%.
Take the example even more extreme, and imagine a world where MLB played once a week like the NFL. In that case, Kershaw would pitch nearly all the innings for his team, and elite pitchers would be 7-8x more valuable than elite position players. They would be as valuable (at least) to their teams and QBs are to NFL teams.