“Fits my hand better” is about the only compelling argument I see, and that’s a matter of personal taste over alleged obselesence.
Don’t get me wrong, I think the XD is a fine tool if you prefer it. I just get antsy when someone bashes the Glock as “obsolete” when it is only marginally different from the latest-and-greatest. (And yes, if someone CAN show me a downright superior tool, I certainly want to know about it.)
I agree that point is subjective. I don’t consider Glocks obsolete. Their just not for everybody. Neither are 1911s, to each their own. Carry and shoot what works best for you, but there is no point in carrying something you hate, unless it is, of course, department policy. Then you had better get used to it, or lobby the department to allow other options.