Developers job is to deliver great software for the company's clients. Hence, any minute they spend not creating and delivering software is a minute wasted.
When developers need to constantly do tasks outside of the purview of delivering software for the company, it takes a significant toil that affects moral and creative output.
Platform Engineering pivots your tooling and culture towards self-service and Development Experience via an Internal Developer Platform. This means that developers can focus on development and deliver software faster because they are not bogged down by learning how to provision infrastructure, doing configuration management or waiting for someone else to do it.