Oh yes, this is 100% accurate.

Very often, when designing ERP, or other system, people think: "This is easy, I just this XYZ I am done." Then, you find that there are many corner use-cases. XYZ can be split to phases, you might need to add approvals, logging, data integrations... and what was a simple task, becomes 10 tasks.

In the first year of CompSci uni, our teacher told us a thing I remember: Every system is 90% finished 90% of time. He was right.