A bold claim. What does the XD do that a Glock doesn't?
The G19 is a straightforward and solid tool. Pull trigger, go bang; don't pull trigger, don't go bang. Capacity is fine, no complexities (manual safety, mag release, loaded chamber indicator), sights are fine, easy to maintain, etc. - the usual litany of "it just works". I'd like to know what alleged improvements could be made.
Yeah...1911's more so. :)
The XD45 will fire lead bullets without voiding the warranty. A Glock won't.