I mean, it’s not overblown. The Sox aren’t a great offensive team against RHP. Generally, as you know, lefties hit righties better - which is why semblance of roster balance is important. Obviously youre not picking a shitty LHH over a really good RHH just due to handedness.
You won’t see me really defend the Harrison move, but if you’re gonna sign an OF, it really should be a lefty that hits RHP well. The lineup needs it. Just so happens this guy named Michael Conforto is a pretty good fit and is a FA.