The argument has little do do with software in actual fact. What it boils down to in long-term strategy and investment.

Building things well so they may serve you for years and years is a form of investment in the long term.

There is a business philosophy credited to Japanese business but evident elsewhere too that thinking, planning and strategy should be as long term as possible, to a ridiculous extent.

I read the biography of Akio Morita, the founder of Sony and while I'm sure it was somewhat biased to laud his achievements, even from the early post-war era manufacturing recording equipment for high end use, in what can be called "start-up mode" the emphasis was on building things of very high quality that would last.

Truly this long term planning mindset is a manifestation of DRY, don't repeat yourself, and is crucial to survival of a nascent business.

The whole disposable software attitude "we'll revisit once we ship" attitude is sinking you before you ever get off the ground.