Requirements design document and the changing role of the product manager

My first project in 2014 was an implementation that was mostly based on documentation.
The civs project is started from the requirements of the software, which is quite standardized.
PSBC License

The project is also the second phase requirement.
Internet projects are not so demanding design.
The csdn project also has little demand.
2018 Project Driven Development.
2019

Technical pre-research, there is no demand for the year, and the development is imitated.
2019 DJDJ imitated development
2020 Oral design development.
2020 is maintenance.
2021

Annual Design Development.mid-project implementation.Project wrapping up in the afternoon.
2022 Modeled on demand development.
There are more examples of software engineering in the university.Need to design more

A lot of it is to communicate with the business to write documents,
to do prototyping.

It gives me an intuitive feeling that the output is to complete the requirements document and prototype design diagram through brainstorming, and then update it to the
graphite document or confluence.