[richardknop]

Very time consuming so probably lot of companies will skip on this to deliver features faster.

Having robust documentation that contains all the knowledge so a completely new team without any project knowledge can easily deploy/support the project can be a big task, especially for large projects.

Even with really good documentation, there will always be required some handover and initial training from the maker team in my experience, it is almost impossible to avoid this.

I guess during sprint planning, if this requirement is being included and the estimates from developers start doubling suddenly the product team might compromise in order to move faster.