Let me ask you this smart guy how can you tell by a quick glance if your fancy smancy Glock has a round in the chamber? You can't!
<pssst, ninja-man> Swap out your Gloch extractor for a new style one with the nub that sticks out.
Second the XD has a cocked indicator letting you know if your gun is cocked or not.
Your trigger will serve. If it's forward, it's cocked. If it's back, it's not.

All in fun.
Look how expensive Glocks are.
Ja, really. I look at what goes into it, and think, "should they really cost five hundred mumble bucks?" Molded plastic and some sheet metal bits, mostly, in the receiver?
The extractor can be removed and quite easily.
Get the backplate off, and the Glock's slide can be completely disassembled in a few seconds. The design is
slick, IMHO.
I do not know much about the reputation the XD has in shooting schools
As for David Bowie (not the sovereign of the Guild of Calamitous Intent) saying he spends more time fixing XDs than customizing them, I'd like to hear what he has to fix so frequently.
I see reports like that, and I'd want to see some numbers, and details on what exactly failed. The one class I went to, back when, it was the high dollar 1911s that had the most problems, of anything.
Seriously, didn't I explicitly say that before and after the segment on XDs?
You did, and I got it. All guns,
like all OSs, suck. Just some worse than others.