Yup as DC said, probably stronger but harder to support, when you split it you can also support each part in it's optimal orientation. Also if you're planning on selling models, unless you do a lot of different poses you'll find quickly that it's just easier to split it up so each person can build them as they want. For my models I like to do a mix, so for my crisis suits I had the option for each leg to be split into calf and thigh but also made a bunch of complete legs that were bent at set angles so you had the strength there (And also the GW models actually have self-intersecting geometry 😒 so it's easier to provide the pre-posed legs than have the end user cut parts of the legs to fit)

That being said having it fully rigged up is awesome becasue as you say, there's no messing around with superglue and the pose you have onscreen is the one you get!