Great observation and there is an answer. When I read up on action shooting with a single action revolver most recommended the shorter barrels as they draw alternately faster or easier. This was supported by looking at the EE where many people are looking for a 4.5/8” and or want to trade a 5.5” for the shorter model. Ultimately however I based the final decision on the fact that I own a lot of pistols and D/A revolvers and when I go shooting almost always grab the 4” over the 5” versions because they balance better in my hand for shooting fast / action style. The only real exception is my Sig 220 10mm in 5 which I like shooting at almost stupid pistol distances but it’s a laser beam so it makes me look like I know how to shoot. So ultimately I agree in most things an extra inch is ALWAYS a good thing but for me unless I’m shooting slow and at distance I can squeeze more out of the better balance (for me) of the 4” versions of handguns. Ymmv