This is a valid concern, but I think it is already a concern. You can get a LOT of performance boost by turning off debugging today. As a LV user, I honestly don't have an answer for you other than, "When they complain, hopefully someone will tell them." As part of LV R&D, my answer is nor much better: "I hope someday we change the default to turn off debugging during a build, including a source distribution made for deployment." But that's my personal call, and others on the team felt we should listen to the customers. A whole lot of people complained about the build times being long. "It doesn't take that long to mass compile VIs when I'm in the IDE, why does it take so long to build?" Easy: the build is doing more work. There wasn't a lot of wasted work in the app build process... the only way to make build times shorter was to do less optimization. So that's now the default. It really irks me. Not my call.
So, I'm not knocking your concern, and it might be a reason not to do the feature. I'll include it in the analysis if I decide to propose this to the team. But I think the concern is already there, so to me, that makes it not something that should restrain improving this aspect of LabVIEW. But, again, others may disagree. :-)