I don't think that is an argument against having a handful of technologies in any given stack. I think its more an argument against having a lot of similar tech

I don't think that is an argument against having a handful of technologies in any given stack. I think its more an argument against having a lot of similar technologies. For example, I wouldn't dream of trying to write a device driver in anything other than C, but I wouldn't try writing a web back-end in C either. OTOH, I promptly ripped out ~100 lines of perl one of our developers insisted on dropping into a bash script a month before he left. Turned out the bash equivalent was actually more concise and didn't require yet another dependency on top of the 4 major programming languages (not including bash) already contained in the project.