Yes because:

• it helps practice writing
• providing variety (another source different from books, docs, videos and academic papers)
• to cement understanding

Ideas to write about:

• process, failure and successes to figuring something out
• hack on some major open source project
• in-depth comparison of projects or approaches, down to source code
• building minimal versions of some production system
• mistakes you made in structuring organizations, or production architecture, or testing

To teach and share, to encourage others, for the community