20%

Two quotes, apropos of nothing:

A lot of software developers are seduced by the old “80/20” rule. It seems to make a lot of sense: 80% of the people use 20% of the features. So you convince yourself that you only need to implement 20% of the features, and you can still sell 80% as many copies.

Unfortunately, it’s never the same 20%. Everybody uses a different set of features.

— Joel Spolsky, Strategy Letter IV: Bloatware and the 80/20 Myth

Half the money I spend on advertising is wasted; the trouble is I don’t know which half.

— John Wanamaker

SaaS is tenuous not because an LLM can "slopfork" it, but rather because its users can build something bespoke that covers the 20% they use.

Meanwhile, the bar for software I buy at work is rising: the coding agent has to be able to operate your software, or it's dead to me.