An insistence on rationalism requires a chain of logic that homogenizes everything it touches. Like async in Rust or JavaScript, nothing other is allowed to play along. It softly - no scratch that - loudly knifes mystery in the back, forcing all unturned stones into a probability distribution dictating that nothing is below but dirt, bugs and gravel.
With this you cut the heart out of hope for those who struggle, wishing that just ahead there were something more than what is already behind them. That over the horizon there is something unknowable which turn faith into something more.