I honestly don't think he gives us a better chance to make the playoffs. I think Robles getting right does. Your best shot at the playoffs is playing Robles.
In 2017 he had a bad start and then finished really well, including playing well in the playoffs. In 2018 he had a bad start, but then started playing well with regular playing time including a decent hitting streak until Martinez benched him inexplicably. In 2019 he had a bad start but has started playing well. It’s clear he does well when he gets regular time.
If he’s playing better then he helps you win. Or he plays well and you trade him for something you need. Letting him ride the bench even in late inning situations makes no sense.