The Red Sox rotation looks good but the only trouble I can find is the BABIP or a stat that can be attributed to pitchers allowing a hit as a result of a ball in play excluding HRs. League average is .300 and pitchers always swing 5-10 points below or above that more or less but always go back to the .300 or swing to it on average.
In a sense it's sort of like a stat on "good" or "bad" luck or not so much luck but other factors such as ballpark factors or club factors or historical team vs team factors, a pitchers swagger/mojo/presence/style/command/stuff etc etc that are hard to explain or perceive or quantify exactly but are there.
Red Sox have below 4.00 projected ERA and FIP along with a top 4 Total WAR amongst SP rotations and the best in the AL in that regard and the fundamentals are solid but if you look at the BABIP it's above .300 and the only other team with a higher BABIP is the Colorado Rockies. On the opposite end you have the Mariners with below 4.00 ERA and FIP projected along with one of the lowest if not lowest BABIP numbers in the MLB.
This luck factor can be attributed to ballpark factors such as elevation, humidity, dimensions etc etc that apply to all three ballparks and regions very much so.
For example in Seattle the humidity and colder temps on average help a pitcher with thicker air and denser particles that are harder for a hitter and a ball to overcome and this helps a pitchers BABIP. In Coors field in Colorado the elevation brings luck down for a pitcher due to elevation on average since the air is less dense or thick and this allows for a hitter to hit a ball easier through less dense and thick air and lets the ball travel easier. In Boston the smaller dimensions and the Green Monster on right field also make for bad luck for a pitcher on average because it allows for balls to be put in play easier as a result of smaller dimensions and funny dimensions at that especially in right field.
In a way it's bad and good because it also applies to the visiting teams on average so it's something that can be used to an advantage as much as it can be a disadvantage at home for the Red Sox and that's the most important thing to take from it.
But it's also troubling if your the Red Sox Pitching Staff and something to be keen and aware of and why a move like Devers to 2B or 1B or DH and Bregman in 3rd or anything to elevate defense matters more than anything to maintain the fundamentals of the pitching, lower BABIP and "bad luck" and adjust for ballpark factors and dimensions to give the pitchers more of an edge.