Perhaps you would agree that in 2026 it is fairly easy it is to actually agentically-dev a very decent ERP given one has the blueprints such as value stream diagrams, caps, BPMNs, domain models, seq. diagrams, state diagrams and... basically a complete SRS bundle. I doubt this person even needs to be super technical to deploy it.
Does it require that you use large (or small) SAAS? I guess not.
It requires one understands business architecture and know-how related to the application of such mental tools.
Traditionally it requires someone (a person) implementing these, translating them into code. Well this is precisely what LLM agentic systems do - translation. And they do it much cheaper with much shorter dev.cycles. And tailored also.