i think removing lens is for "logistical" purposes la. for those with much equipment, it may be more compact to remove the lens. also, for those with more than one body, may wanna swop lens among the bodies, so better to remove the lens also.
most of the time i have to remove the lens when i store in the bag or dry box, but sometimes i lazy i just JAM IT IN :angel:
i also dun like to anyhow remove lens. last time kena major sensor dust balls before and didn;t know what to do :sweat:
Like most here have mention the choice is your. It all about a good fit inside. The only thing I add is make sure you have the protection cap on the DLSR front and the cap for the back end of the lens.