Why is there no vanilla SAP Business One instance to start with?

We person evaluated and tested  SAP Business One # and would similar to commencement utilizing it for our tiny manufacturing automation company, archetypal chiefly for Purchasing & Logistics, past later, we privation to adhd Sales and Finance

However, we are struggling a batch with the attack of astir providers to person weeklong implementation efforts earlier being capable to enactment with the system.  We are utilized to the sign-up and spell process that modern SAAS platforms offer. Why does it look to beryllium intolerable to get entree to a vanilla SAP B1 lawsuit for america with minimal configuration, truthful that we tin get started
How come, I tin get a demo relationship and play with a system, but erstwhile I privation to usage it successful the nonstop aforesaid mode arsenic successful the demo, I cannot?

Why bash I person to person sessions with an implementation spouse to talks astir requirements, erstwhile I person ne'er truly worked with the strategy and don't cognize my requirements? I archetypal privation to work with the standard, larn what we miss and bid needed extensions afterward.

It's 2024: Waterfall projects are agelong dead, agile is the mode to go.

Anyone present understands my struggle?