I was thinking more generally and thus put the noun input in parenthesis in the quote. With agents and slop, the value for humans being there may quickly spiral down. There are also a lot of bad stuff already there, including malware and such.
If you have your own infrastructure instead of a mega-platform, you can control these things more easily.
I can build my own curl in a week, but the value that curl gives me is that it's a multi decade old library, by a person that has dedicated his live to keeping the project there, keeping a quality bar etc.
The value of curl is not curl, it's the human behind it.
The great open source tools out there have handled, worked around, or influenced away many many bugs and edge cases out in the real world, many of which you wont think of when initially designing your own. The silent increase in stability and productivity resulting from this kind of thing is as vast as it is hard to see/measure. It feels like the quote about expertise saying someone "has forgotten more than I'll ever know about [subject]".
Thank you to everyone powering our collective work.