Harry Hawk first published this BYO-UI essay on the RevSure site on April 1, 2026. This page records its place in the development of the thesis; the complete article remains with its original publisher.
The original build-versus-buy answer
The essay explains why cheaper AI-assisted interface development does not erase the value of enterprise SaaS. Data models, integrations, identity, permissions, domain logic, reliable actions, and operating history remain expensive to reproduce and maintain.
Its practical recommendation is to buy the foundation that is expensive to get wrong, then build the role-specific interface, analysis, workflow, or agent that makes that foundation more useful.
That is not a threat to SaaS. It is the next stage of SaaS.
Harry Hawk has a professional relationship with RevSure. The original article is presented here as publication provenance for the BYO-UI thesis, not as a vendor recommendation.