Calling Unix philosophy a ״philosophy” is being overly generous. It’s a mindset shared by many early computing hackers, propagated through the times because it’s simple and easy enough to follow. See “worse is better” for why this has been a detriment for the software industry.

As for webapps, they have nothing to do with unix philosophy and much more to do with Steve Jobs, iphone apps and too many non technical product managers angling to push out “products” (also an aspect of the whole MVP and ship early mentality)